The ratio of the magnitudes of centripetal and centrifugal force is 1: 1.
Thus, the magnitudes of the centripetal and centrifugal force are the same.
Explanation:
Centrifugal force is a fictitious force, experienced by an observer moving in a circular path along with the body. For the observer, the body appears to be stationary.
So the net force on the body must be zero, therefore the centrifugal force must be equal in magnitude and opposite in direction to the centripetal force so that the body appears to be stationary.