Third proportional to $4$ and $6$ is

Third proportional to $4$ and $6$ is
  1. $9$
  2. $10$
  3. $24$
  4. $2$

Solution

$4:6::6:x \Rightarrow 4x = 36 \Rightarrow x = 9$.

Asked in: MH-SSC-9

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