Question

Find the fourth proportional of 2.1,1.8 and 8.4

Answer 1

Answer:

7.2

Step-by-step explanation

let the fourth proportion be x

2.1:1.8::8.4:x

2.1/1.8=8.4/x

x*2.1=8.4*1.8

x=8.4*1.8/2.1

x=7.2