Question

Find the third proportional to 5 ,7 Please do the working

Answer 1

9.8
because,
b^2=ac
7^2=5c
49=5c
c=49/5
c=9.8

Answer 2

Answer:

let the third proportional be x

then,

21/4 × x = 7×7

x= 49×4÷21

x= 28/3

x= 9 1/3