Question

If $x,y,a,b$ are in proportion , then

• A. $xy=ab$
• B. $xb=ay$
• C. $ax=by$
• D. $\frac{x}{y}=\frac{b}{a}$

Answer 1

The correct option is B

$xb=ay$

Since , $x,y,a,b$ are in proportion , so :

$$\begin{gathered} \frac{x}{y}=\frac{a}{b} \\ xb=ay \end{gathered}$$

So, Option (b) is the correct answer.