What is the fourth proportional to 0.12, 0.16 and 0.21?
Show answer & explanation
Correct answer: C
Explanation
The Correct answer is option 3 i.e. 0.28.
If a, b, c, d are in the ratio, then
a : b : c : d
a/b = c/d
Let's assume k is the fourth proportional to 0.12, 0.16, and 0.21
⇒ 0.12/0.16 = 0.21/k
⇒ 12k = 16 × 0.21
⇒ k = 0.28