What are the odds hitting trips on fourth street in seven card stud?

[AceofSpades]

If it costs $2 to call one bet and I have a small pair that needs to improve to trips on fourth, then how much do I have to make on the trips to have it be profitable?

Thanks
joseph

[LetYouDown]

Well, you know other cards...which makes a pretty big difference, but assuming you know nothing about anyone's cards, it's 1/24 or 23-to-1.