Question

Check whether the given terms $18,10,9,5$ are in proportion.

Answer 1

Four quantities $a,b,c$ and $d$ are said to be in proportion if $a:b=c:d$

or ln lowest term $\frac{a}{b}=\frac{c}{d}$

Here given quantities are $18,10,9,5$

$$\begin{gathered} 18:10=9:5 \\ \frac{18}{10}=\frac{9}{5} \\ \frac{9}{5}=\frac{9}{5} \end{gathered}$$

Since, ratio of first two term equals to the ratio of last two terms.

Hence, given terms $18,10,9,5$ are in proportion