Find the missing term:7: a : : 63 : 90.

Given :

The first, third, and fourth terms of a proportion are 7,63 and 90 respectively.

To do :

We have to find a second proportion.

Solution :

Let the second term in the proportion be a.

7: a:: 63: 90

We know that,

Product of means $=$ Product of extremes

$⇒ 7 \times 90 = a \times 63$

$⇒ 63a = 630$

$⇒ a = \frac{630}{63}$

$⇒ a = 10$

So, the second term in the proportion is 10.

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Updated on: 10-Oct-2022

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