Find the mean proportional between 3 and 27.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 9.
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 = 3 × 27
⇒ x = √(3 × 3 × 3 × 3)
⇒ x = 3 × 3 = 9
Hence, the mean proportional will be 9.