Smaller water pump pulley

Thanks everyone for the help! I think I got it taken care of. I got rid of the crappy flex fan that was on there and threw a 6 blade steel fan on it. I took the car out for a quick drive, and then let it idle for about 20 minutes afterwards and it didn't creep up past 180. So I'm hoping I'm in good shape now. I'll know for sure on a really hot day. Comparing the fan blades, the steel fan has a lot wider of a blade, and has more pitch than the flex fan, which also put it a little closer to the radiator which I think helps some. I'm planning on a 60 mile drive for saturday, so that will be the test! Thank again everyone. I appreciate it!

Any one know how to figure the ratio of pulleys ? same size is 1 to one , going smaller on my water pump---------