Question

find the fourth proportional to 12,8and21​

Answer 1

Answer:

14

Step-by-step explanation:

8×21÷12

actually we classify them as products of middle term = products of extreme terms

21,8 are middle term and 12, unknown are extreme terms

then equate them and you will get your answer . I think your answer will be 14

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Answer 2

Answer:

14

Step-by-step explanation:

12,8,21,x

12:8::21:x

12×x=21×8

x= 21×8÷12=14

Ans =14