Question

What is the fourth proportional of 4, 7, 12?​

Answer 1

Answer:

21

Step-by-step explanation:

Steps:

Given,

4:7::12:x …(1)  

4/7 = 12/x, cross multiply to get

4*x = 12*7

4x=84

x=84/4

x = 21.

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Answer 2

Given - Three proportional numbers

Find - Fourth proportional

Solution - The fourth proportional will be 21

Let the fourth proportional be x.

Now, represent the given numbers in ratio and proportion form.

4:7::12:x

Solving the given ratio and proportion to find the value of x.

$\frac{4}{7} = \frac{12}{x}$

Performing cross multiplication to find the value of x.

4*x = 12*7

Performing multiplication and division to find the value of x.

x = 21

So, the fourth proportional will be 21