Which of the four figures can replace the question mark?
Select the option that would come next in the given figure series.
If \( \frac{60}{75} \) is equivalent to \( \frac{4}{x} \), then the value of x is:
The acceleration due to gravity at the surface of the earth (mass M and radius R) is proportional to _____.
\( \frac{M}{R} \)
MR
\( \frac{M}{R^2} \)
\( \frac{M^2}{R} \)