The figure shows two parallel nonconducting rings with their central axes along a common line. Ring 1 has uniform charge Q1 and radius R; ring 2 has uniform charge Q2 and the same radius R. The rings are separated by a distance 3.00R. The ratio of the electric field magnitudes of Ring 1 and Ring 2 at point P on the common line is 4.19. What is the ratio of charge magnitudes Q1/Q2?