Question

Find the value of $x$ in proportion 1.2 : 3.9 :: 2 : $x$

• A. 5.6
• B. 2.34
• C. 6.5
• D. 5.8

Answer 1

The correct option is C

6.5

Given 1.2 : 3.9 :: 2 : $x$ are in proportion

Hence product of extremes = product of means

$1.2\times x=3.9\times 2$

$x=\frac{3.9\times 2}{1.2}$

$x=6.5$