Get a stack, Jack.
Doesn't have to be the biggest, most expensive thing out there. Doesn't even have to match! If it sounds good, it is good...
I use this pairing for Salsa dances without PA support and the master volume doesn't go beyond 9 o'clock. If the latest batch of recordings is anything to go by, (made with a Zoom at the far end of the dance floor) it's covering the whole area, no problem.
LOL - it probably helps a lot that we have no guitarist! (There are two percussionists, though. And 3 horns. And 150 dancers!)
Sometimes I use a smaller amp and incorporate some PA support with my own gear. I find the key there is to have good speakers that can take a bit of a pounding, then exercise common sense and don't pound them too too hard. (QSC K series or equivalent can deal - cheaper stuff, I wouldn't...)
Subwoofers are for young people's tailbones and powered 10s & 12s are for intelligibility which does include bass guitar IME.
For this yard party with an oldies/rockabilly group, I used just the one bass cab with a 50W tube amp and let the powered speakers deliver maybe half of the bass guitar to the audience. (I walked out front a bit & could hear it just enough in my mains.)
That tube amp is a little more potent driving two cabs at 4Ω. But, between my rig, the PA and the drum set, I was already hauling enough **** for this job.