Find the mean proportional between 9 and 25.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 15.
Let the given numbers be a and b and, the mean proportional be x.
Then, a/x = x/b
⇒ x2 = ab
Similarly, in the given question
⇒ x2 = 9 × 25
⇒ x = √(3 × 3 × 5 × 5)
⇒ x = 3 × 5 = 15
Hence, the mean proportion will be 15.