Question

Find the fourth proportional to 4, 9 and 12?

A) 18 B) 21 C) 24 D) 27​

Answer 1

Fourth proportional to 4, 9, 12 is 27.

Answer 2

Answer:

Let the fourth proportional to 4, 9, 12 be x

Then, 4:9::12:x

⇒4×x=9×12

⇒x=

4

9×12

=27

∴ Fourth proportional to 4, 9, 12 is 27.