It's probably not a one to one ratio. Do you have any suggestions? 
My egg salad has a ratio of 100% eggs, 0% potatoes.  My potato salad has a half dozen eggs to 2 1/2 kilos/5 pounds of potatoes, I chop them fine.  Sometimes I will make pretty eggs and put them on top though, usually sliced thin or quartered, then I use 8 eggs. 