Question

Find the fourth proportion of the numbers 2.8,14,3.5​

Answer 1

Answer:

Let the fourth number be x

Then

=2.8:14::3.5:x

We know that

product of extremes = product of means

∴ 2.8×x=14×3.5

2.8x=49

x=49/2.8

x=17.5

Hence x=17.5