It seems my math was off also. For some reason, in my calculation I was thinking 4 parts total instead of 4 water to 1 sugar. I also did not consider the loss of volume of dissolved sugar. Ron's numbers are correct. So the correct measurements would be 1 1/2 parts concentrate to 3 parts water. If measuring by the cup it's 1 1/2 cup of concentrate to 3 cups water. Sorry for all the confusion, but I'm glad it eventually led to a more accurate formula than that of the original post. Donna's idea is a good one that I will likely use in the future. Thanks
@rattlebox for fixing my mistake.