Question

the ratio of third proportional to 12 and 30 the mean propotional between 9 and 25 is​

Answer 1

Answer:

Let the third proportional be x

12:30:x

= 12:30 = 30:x

= 12 × x = 30 × 30

= x = 900 ÷ 12

= x = 75

Let the mean proportional be x

9:x:25

= 9:x = x:25

= 9 × 25 = x × x

= 225 = x^2

= x = 15

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Answer 2

Answer:

Let the third proportional be x

12:30:x

= 12:30 = 30:x

= 12 × x = 30 × 30

= x = 900 ÷ 12

= x = 75

Let the mean proportional be x

9:x:25

= 9:x = x:25

= 9 × 25 = x × x

= 225 = x^2

= x = 15

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