Question

What is the fourth proportional to 5, 16 , 10 ?

• A. 15
• B. 20
• C. 52
• D. 32

Answer 1

The correct option is D

32

Let x be the required fourth proportional.

So, 5, 16 , 10 , x are in proportion

In proportion,

product of extremes = product of means

$\Rightarrow$ $5\times x=16\times 10$

$\Rightarrow$ 5x = 160

$\Rightarrow$ $x=\frac{160}{5}$

$\Rightarrow$ x= 32

Answer= 32