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" If three quantities are in continued proportion, the product of the extremes is equal to the square of the mean. "
Elements of Algebra - الصفحة 155
بواسطة Silvestre François Lacroix - 1818 - عدد الصفحات: 276
عرض كامل - لمحة عن هذا الكتاب

The Young Algebraist's Companion: Or, A New & Easy Guide to Algebra ...

Daniel Fenning - 1751 - عدد الصفحات: 272
...perfectly well. • Phi. Then you are to obferve as follows. OBS ERv. i. Any three Numbers in Geometrical Proportion, the Product of the Extremes is equal to the Square of the Mean ; that is, equal to the middle Term multiplied by or into itfelf. Let the 3 Numbers be 4, 16, and 64....

Elements of Geometry

Adrien Marie Legendre - 1819 - عدد الصفحات: 574
...proportion. When B = C, the equidifference is said to be continued ; the same is said of proportion, when b = c. We have in this case that is, in continued equidifference...extremes is equal to double the mean ; and in proportion, tlie product of liie extremes is equal to the square of the mean. From this we deduce the quantity...

Elements of Arithmetic

Etienne Bézout - 1824 - عدد الصفحات: 238
...product of the extremes and means may then be taken reciprocally for each other. And in a continued proportion, the product of the extremes is equal to the square of the mean term: because, the two mean terms being equal, their product is the square of either. Then, to find...

A Theoretical and Practical Arithmetic: In which the Principles of that ...

Bézout - 1825 - عدد الصفحات: 258
...take the product of the extremes for that of the means, and reciprocally. Therefore, in the continued proportion, the product of the extremes is equal to the square of the mean term; for the two means being equal, their product is the square of one of them. Therefore, to have...

The elements of algebra

Andrew Bell (writer on mathematics.) - 1839 - عدد الصفحات: 500
...proportion, the other two are means, and conversely. (359.) COR. 4. — If three quantities be in continued proportion,' the product of the extremes is equal to the square of the mean.1 Let а:Ъ — Ъ:с, then ac = bb = № (360.) Hence when the extremes are known, the square...

Elements of algebra, by A. Ingram and J. Trotter

Alexander Ingram - 1844 - عدد الصفحات: 262
...= - ; whence a : b : : c : d or c : d : : a : b. ao PROP. II. If three quantities are in continued proportion, the product of the extremes is equal to the square of the mean, and conversely. Let a:b::b:c; then axc = bxb or ac — b*. Conversely. If the product of any two quantities...

A Treatise on Algebra

Elias Loomis - 1846 - عدد الصفحات: 380
...numbers are proportional ; that is, 5 : 6 : : 10 : 12. (215.) If three quantities are in continued proportion, the product of the extremes is equal to the square of the mean. If a:b::b:c. Then, by Art. 212, ac = bb = b\ Conversely, if the product of two quantities is equal...

An Elementary Treatise on Algebra: In which the Principles of the Science ...

Samuel Alsop - 1846 - عدد الصفحات: 300
...dividing by bd, we have a с . b=d Or, • , в : 6 : : с : d. 44. If three magnitudes be in continual proportion, the product of the extremes is equal to the square of the mean. If a : b : : b : c, then ac = ¿>3. ab *-? Multiply by be, and ac = №. 45. If four quantities be...

A Treatise on Algebra

Elias Loomis - 1846 - عدد الصفحات: 376
...numbers are proportional ; that is, 5 : 6 : : 10 : 12. (215.) If three quantities are in continued proportion, the product of the extremes is equal to the square of the mean. If a:b::b:c. Then, by Art. 212, ac — bb= V. Conversely, if the product of two quantities is equal...

A Treatise on Algebra: In which the Principles of the Science are Familiarly ...

Samuel Alsop - 1848 - عدد الصفحات: 336
...then dividing by bd, we have a с b=d Or, a : b : : с : d. 44. If three magnitudes be in continual proportion, the product of the extremes is equal to the square of the mean. If a : b : : b : c, then ac = b3. ab *~? Multiply by be, and ac = b*. 45. If four quantities be proportionals,...




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