Find the fourth proportion of the following numbers.
of 18, of 20, of 28.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 32.
1/3 × 18 = 6
4/5 × 20 = 16
3/7 × 28 = 12
6 :16 :: 12 : x
6/16 = 12/x
6x = 16 × 12
x = 32