Question

Find the third proportional of 18 and 72. Please tell the formula step by step.​

Answer 1

Step-by-step explanation:

no formula only concept

let the third proportion be x

18:72:x

18/72=72/x

bro no such formula this is maths don't remember formulas that will not help at all..

x=72*72/18

x=288

if u call this a formula then u will not be able to understand maths at all rest your wish....

Answer 2

The value of x is 288.

Step-by-step explanation:

• The third proportional is the variable in a continued proportion with two equal values.
• In continued proportion a:b:: b:c , c is the third proportional to a and b.

Let x be the third proportional to 18 and 72.

Therefore , we have

18 : 72 :: 72 : x

$\Rightarrow\dfrac{18}{72}=\dfrac{72}{x}\\\\\Rightarrow\ x=\dfrac{72\times72}{18}\\\\\Rightarrow\ x=288$

Hence, the value of x is 288.

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