Question

The mean proportional between 2.8 and 0.7 is:

• A. 1.4
• B. 1.8
• C. 1.9
• D. 1.2

Answer 1

Answer:

A. 1.4

The mean proportional between two numbers (a) and (b) is:

$\sqrt{ab}$

Given:

$a = 2.8,\quad b = 0.7$

Calculation:

$\sqrt{2.8 \times 0.7} = \sqrt{1.96} = 1.4$