Welcome to our forum.
Hopefully you can get the answers you need here. There's surely a good amount of information, on just about any topic.
"In a poly relationship do you need a balanced girl-to-boy ratio or is it fine to have one man and three or four girls?"
Either way is fine, it really depends on the unique individuals involved.
Any more questions, just fire away.
I'll do my best to answer (and others will probably chime in as well).