Question

find the 4th proportional
6,9,20
​

Answer 1

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.

Answer 2

Step-by-step explanation:

Let 4th proportional be x

then, =6:9::20:x

=by taking product of means=product of extremes

=6x=20×9

=6x=180

then x=180/6

Thus:- x=30 is the correct answer...