Third proportional of $5$ and $10$ is

Third proportional of $5$ and $10$ is
  1. $20$
  2. $15$
  3. $2$
  4. $50$

Solution

$5:10::10:x \Rightarrow 5x = 100 \Rightarrow x = 20$.

Asked in: MH-SSC-9

Practice more Ratio and Proportion questions on Aicharya