Question

Find the third proportional to 20 and 30.​

Answer 1

Answer:

Let x be the third proportional

20:30 =30:x

= 20x=30x30

= x= 30x30/20

x = 45

Answer 2

Answer: The third proportion of 20 and 30 is 45.

Step-by-step explanation:

According to the question,

As we have to find the number are 20 and 30,

As by the formula a:b :: c:d.

⇒$\frac{a}{b} = \frac{c}{d}$

As let the third proportion be x,

20 : 30 :: 30 : x

$\frac{20}{30} = \frac{30}{x}$

20x = 900

$x = \frac{900}{20}$

x = 45

So now the third proportion of 20 and 30 is 45.

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