Beckles: Perhaps the problem is your airline. United (with the most widebodies in the (US) industry) DC10-10s (with the least up fromt space)have 28 first class seats.
At the high end,the 747-400 has 36 first class and 123 business class. (thats more seats up fromt than most 737, 727, a320 or super-80s have on the entire plane).
Some others: 747-100 has 18 first and 70 business
767-300 has 34 first and 63 business.
777-200 has 12 first and 49 business.
There are others, but you get the idea.
As for the ratio, I flunked algebra, but I accept your supposition that *some* small planes have a better ratio.
One of the reasons I fly Untied, though is all the widebodies, and all those seats up front...