I have to wonder why anyone would let humans just set up whatever council they want, anyways. Even after getting notched up on the power ladder thanks to Sovereign fucking up everybody's fleets, humanity is still the small fish in the pond. Didn't the Turians alone have like 10 times the dreadnaughts humanity was allowed to build, and all of them were more technologically advanced?
I think it was 3 to 1 based on the Codexs I read years ago. I also remember reading Humanity has been pumping out all the hardware they could since the first contact war (skirmish) with the Turians. And they caught up technologically extremely fast because Humans Are Just Better. I think the Turian's having better technology on their Dreadnaughts (even though it would make sense) is an overstatement due to them knowing Humanity is primed to take over being the military leaders of the Citadel races.
I'm pretty sure the 3 Dreadnaughts that get blasted in the opening attack on the Citadel were Turian and I think they were required to keep a certain amount of them there at all times, so those were likely lost as well. The basic consensus at endgame was that the entire Citadel fleet, with except of the Human fleet (even if you sacrifice ships to defend the council), was in shambles and that Humanity was in position to take military power and no one could stop them. It's telling that humanity lost loads of ships defending the Citadel, but was still a major player. IIRC, only 5th Fleet showed up to the party whereas the Turians had a large portion of their entire Navy at the Citadel.
There were numerous references to Humans inserting themselves into all areas of galactic business at an alarming rate after first-contact and it was assumed that, besides the Turians, they had the strongest Citadel race fleet. I always assumed they made up for the lack of Dreadnaughts with sheer numbers of smaller ships. The Turians may bitch, but the Citadel had been bending over backwards for Humans giving them access to technology and resources far faster than any other race. And I could be channeling some other Sci-Fi, but I also remember a reference to Human breeding only being surpassed by the Krogan, which is worrisome for some races. It's really no surprise they can field the numbers they can.
Anyways, it's been years since I played ME, so take this with a grain of salt.