Question

State whether true or false
Fourth proportion of 1.2, 3.8 and 9 is 28.5.

• A. True
• B. False

Answer 1

The correct option is A True

In $a:b::c:d;d$ is the fourth proportional.
For, $1.2:3.8::9:d$, product of extremes $=$ product of mean
$1.2\times d=3.8\times 9$

$d=28.5$