Question

Find the fourth proportional to: (i) 4, 7, 20 (ii) 1.5, 2.5, 4.5

Answer 1

Answer:

1) 4:7= 20:x

so 4/7=20/x

so x is equal to 20×7/4

so x is 35

2) 1.5/2.5=4.5/x

so x =4.5×2.5/1.5

7.5