Bluebulb Projects' The Measure of Things presents:
3,500 is about one-tenth the number of Seats in Fenway Park
In other words, it's 0.094413 times the count of Seats in Fenway Park, and the count of Seats in Fenway Park is 10.5920 times that amount.
(2013 figures; daytime capacity) (a.k.a. The Cathedral of Boston) (Boston, Massachusetts)