Question

10. If the third proportional to 7 and x is 28, find the value of x.
Hint. 7:x:: x: 28. Find x.​

Answer 1

Answer:

7*28=x^2

therefore, x=$\sqrt{7*7*4}$

                  x=14

Thank u and kindly mark my answer as brainliest if found it useful and appropriate.

Answer 2

Answer:

$7 : x : : x : 28 \\ means \: that \\ \frac{7}{x} = \frac{x}{28} \\ by \: cross \: multiplication \\ 7 \times 28 = x \times x \\ {x}^{2} = 196 = {14}^{2} \\ then \\ x = 14$