Question

49 : 81 :: 100 : ? how can solve this match

Answer 1

As 49 is a square of 7
and 81 is a square of 9 (7+2)
So the ans will be the (root of 100 + 2) square
as the root of 100 is 10
then the ans is 10 + 2 whole square
so the ans is 12 square
which is 144

Answer 2

Answer:

The fourth term is 8100 / 49

Step-by-step explanation:

Let fourth term of the proportion be x

49 : 81 : : 100 : x

$\frac{49}{81}$ = $\frac{100}{x}$

By doing cross multiplication:

49  × x =100 × 81

       x = 8100 / 49