Question

First, third and the fourth terms of a proportion are $6,12$ and $36$ respectively. Then the second term is :

• A. $12$
• B. $18$
• C. $16$
• D. $108$

Answer 1

The correct option is B $18$

$6:x::12:36$

$\therefore$ $\frac{6}{x}=\frac{12}{36}$

$\therefore$ $x=\frac{6\times 36}{12}=18$.

the second term is $18$.