Question

the First ,second and Fourth terms of a proportion are $40,30$and $45$respectively.Find the third term.

Answer 1

Find the third term:

We know that if $a,b,candd$are in proportion

then $a:b::c:d$

Let the third term be $=x$

$\Rightarrow 40:30::x:45$

$\Rightarrow \frac{40}{30}=\frac{x}{45}$

$\Rightarrow \frac{4}{3}=\frac{x}{45}$

$\Rightarrow x=\frac{4\times 45}{3}$

$x=60$

Hence, the third term is equal to $60$.