Question

Find the third proportional of: $1.8$ and $0.6$

Answer 1

$\frac{1.8}{0.6}=\frac{0.6}{x}$

$\frac{18}{6}=\frac{6}{10x}$

$10x=\frac{36}{18}=2$

$x=\frac{2}{10}=0.2$

Hence, the third proportion $=0.2$.