The pattern I have seen is one that has stayed true for the entire time I have been on Steemit. My number of followers is about 1/3 the number of the number of posts I have made and 1/2 the number of people that I have followed. I think this holds roughly true because of the interaction I have with the the people that I follow and comment on which are also counted as posts. Recently these numbers are the furthest from 1/3 and 1/2 that they have been but it can still give me a rough guide for growing my following.
I am a typical Steemit user that came here without a following from youtube or facebook or anything like that. However, everyone uses steemit a little bit differently so I wouldn't be surprised if many Steemians weren't experiencing similar proportions. I also wouldn't be surprised if some of you are noticing similar numbers. I think there is something to be said for the number of posts and amount of interaction being key parts of growing a following.