Find the mean proportional between 169 and 121.

Correct option is B

Given:
Two numbers: 121 and 169.
Concept: Used:
The mean proportional or geometric mean of two numbers a and b is given by the formula: $$\sqrt{(a × b)}$$​​
Solution:
Mean proportional =$$\sqrt{121 \times 169}$$​​

Mean proportional = $$\sqrt{11^2 \times 13^2}$$​​

Mean proportional = 11 × 13

Mean proportional = 143
Therefore, the mean proportional between 121 and 169 is 143.