Question

find fourth proportional of 4,7 and 12 ​

Answer 1

Step-by-step explanation:

let the fourth proportional be x.

SO, 4:7::12:x

We know that, product of means=product of extremes

=>4x=12×7

=>4x=84

=>x=84/4=21

HENCE,21 IS THE FOURTH PROPORTIONAL