Question

Find the fourth proportional to the numbers 5,7,3
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Answer 1

Step-by-step explanation:

Let the fourth number be x

Then

=5:7::30:x

We know that

product of extremes = product of means

∴ 5×x=7×30

5x=210

x=210/5

x=42

Hence, x=42

Answer 2

Answer:

Here is your answer

Step-by-step explanation:

Let the fourth proportional be x.

Then, 5 : 7 :: 30 : x

⇒ 5 ×x = 7 ×30                                      [Product of extremes = Product of means]

⇒ 8x = 216

⇒ 5x = 210

⇒ x = 42