I've been having some trouble understanding acceleration due to gravity. On earth, the acceleration due to gravity is an average of 9.80m/s^2. The mass of earth is approximately 5.972 × 10^24 kg. The acceleration due to gravity on the surface of the sun is 273.7m/s^2, and its mass is 1.989 × 10^30 kg. 
So:
m/a=m/a
5.972 x 10^24 kg/9.80m/s^2 = 1.989 x 10^30 kg/273.7m/s^2
6.09=/=7.267
Why don't the above numbers equal each other? Is it because i am doing mass divided by acceleration?