Find the fourth proportion of the following numbers. 1/3space of space6, 4/5space of space15, 3/7space of space21

SSC Selection Post 2023 PYQ — Question 66

Find the fourth proportion of the following numbers.
$\frac{1}{3}\space of \space6, \frac{4}{5}\space of \space15, \frac{3}{7}\space of \space21$

Show answer & explanation

Correct answer: B

Explanation

The correct answer is Option 2 i.e. 54.

(1/3 of 6) = 2

(4/5 of 15) = 12

(3/7 of 21) = 9

Fourth proportional = (12 × 9)/2 = 54