Find the numbers such that their mean proportion is 14 and third proportion is 112.

156, 645

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129,489

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71, 428

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77, 493

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Solution

The correct option is C
71, 428

Let the numbers be x and y ; x*y =196
$X = \frac{196}{y}$ and $112 x = y^{2}$
So, y =28, then x =7
So, numbers are =71,428.

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