The mean proportion of 169 and 144 is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 156.
Let the mean proportion be Q.
The proportion becomes = 169 : Q :: Q : 144
According to the concept,
(144 × 169) = (Q × Q)
⇒ Q2 = (144 × 169)
⇒ Q = 12 × 13
⇒ Q = 156
∴ The mean proportion of 169 and 144 is 156.