The mean proportional between a number and 20 is 50. What is that number?
Answer & explanation
Correct answer: option 1
Let the number be x,
Mean proportion between x and 20 = $\sqrt{x\; \times\; 20}$ = 50
Squaring both sides,
20x = 2500
x = 125
The mean proportional between a number and 20 is 50. What is that number?
Correct answer: option 1
Let the number be x,
Mean proportion between x and 20 = $\sqrt{x\; \times\; 20}$ = 50
Squaring both sides,
20x = 2500
x = 125