Question

What is the third proportional to the numbers 9 and 45?
1. 230
2. 220
3. 225
4. 235

Answer 1

Correct Answer - Option 3 : 225

Given

Numbers are 9 and 45

Concept used

a, b, c are in proportional then, third proportional be

a/b = b/c

c = b²/a Rightarrow

Calculation

Let the numbers be 9, 45 and x

⇒ 9/45 = 45/x

⇒ x = (45 × 45)/9

⇒ x = 5 × 45 = 225

∴ The third proportional is 225