Cl is Chloride, I think the 110 you're looking at is Calcium. 275/50 = 5.5, 200/50 = 4, etc.
Don't get too hung up on the Sulfate:Chloride ratio per se, beers with 300 ppm each, for example, will taste a different than those with 10 ppm each, even though it's the same ratio- it's a loose...