Find the missing number in the box:
$$\dfrac{8}{\square}=\dfrac{3.2}{4}$$
Ratios that are equal are called equivalent ratios and are said to be in proportion.
To find an equivalent ratio, we multiply or divide both the numerator and denominator by a same number.
$$\dfrac{8}{\square}=\dfrac{3.2}{4}$$
Numerator of $$\frac{3.2}{4}$$, is multiplied by $$2.5$$ to get $$8$$
So we multiply denominator, $$4$$ as well by $$2.5$$
$$\dfrac{8}{10}=\dfrac{3.2}{4}$$
$$\therefore \textbf{The missing number is 10}$$