4th playable sims

515$. Thats the cost for fourth player (but only availible after buying the 3rd for 175$)

Dose anyone knows how much the fourth playable sim cost?

You have to buy the 4 playable slot with simcash

Assuming the 4th adult is one that you've married from your Sims neighborhood and not one you created? Check to see what your family picture frame says for each individual Sim. Mine showed options to have them move in and become playable. Not sure if this is exactly what's happening with you though without seeing your game. :(