EV:
(3.5 + x) * 4 / 47 - 0.5 * 43 / 47 > 0
x > 1.875

Where x is the number of big bets you'll get out of them if you hit. You should call if you expect to get more than 1.875BB out of them on the turn and river. This ignores the rake and that you'll sometimes lose when you make your hand. Even so getting more than 2BB out of three players on two big-bet streets should be doable against the opponents you describe and since you close the action on the flop, easy call.