Question

the first three terms of a proportion are 20 30 and 40 find the 4th term​

Answer 1

$\huge \sf{ \color{brown}Answer}$

Let the fourth term be x

The General Structure for a proportion is a:b :: c:d

20 : 30 :: 40 : x [The sign '::' can be replaced by '=' i.e the sign of equality]

$\rm \dfrac{20}{30} = \dfrac{40}{x}$

$\sf \: x = \cancel \dfrac{1200}{20} = \red{60}$

Therefore, 60 is the required fourth term of given proportion.

Answer 2

Answer:

4 th term is 60

Step-by-step explanation:

Let fourth term be x

The no's 20,30,40,x are in proportion

So, 20 : 30 : : 40 : x

   20 /30 = 40 / x

By doing cross multiplication;

20 × x = 30 × 40

       x = 1200 /20

       x = 60