Question

Fill in the following boxes so that the four numbers are in proportion:

$80,64,\_\_,24$

Answer 1

If $a,b,c,d$ are four numbers such that $\frac{a}{b}=\frac{c}{d}$, then $a,b,c,d$ are said to be in proportion

Assume the missing number be $x$,

then

$$\begin{gathered} \frac{80}{64}=\frac{x}{24} \\ x=\frac{80\times 24}{64} \\ =30 \end{gathered}$$

Hence, the required answer is $30.$