Question

Determine if the following are in proportion:
$25,30,40,48$

Answer 1

$25,30,40,48$ (to determine whether they are in proportion)

If $\frac{a}{b}=\frac{c}{d}$ (numbers are said to be in proportion)

$\frac{a}{b}=\frac{25}{30}=\frac{5}{6}$;

$\frac{c}{d}=\frac{40}{48}=\frac{5}{6}$

since, $\frac{a}{b}=\frac{c}{d}$

(They are in proportion).