Question

Find the value of $x$ for the following:

If $3,15,30$ and $x$ are in proportion.

Answer 1

Compute the required value:

Here we have ,

$3,15,30$ and $x$ are in proportion.

Then, $3:15::30:x$

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

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

$3:15::30:x$

$$\begin{gathered} 3\times x=15\times 30 \\ 3x=450 \\ x=\frac{450}{3} \\ x=150 \end{gathered}$$

Hence, for the value of $x=150$.

$3,15,30$ and $x$ are in proportion.