Question

Find the value of $x$ in the proportion $5:10::x:30$

Answer 1

Here we have, to find the value of $x$

If it is given, $5:10::x:30$

And, we know that if $a,b,c\&d$ are in proportion i.e. $a:b::c:d$

Then, $a\times d=b\times c$

Now, Here We have $5:10::x:30$

Then, $$\begin{gathered} 5\times 30=10\times x \\ 10x=150 \\ x=\frac{150}{10} \\ x=15 \end{gathered}$$

Hence, for the value of $x=15$ which satisfied $5:10::x:30$