I think math is kinda not so important in this spot but, we're missing some crucial information.
What tournament are you playing, what is the blinds structure, how many players is left in the tourney, how many players left untill bubble, what stats do you have on a shoving player, what hand do you have?
All in all unless, you have a premium hand I wouldn't play with 3rd of my stack just to bust out a short player unless I have more then a decent chance to win. (I would also call with hands like 88+, ATo+, but not without stats on the shoving player)
In MTT's I think survival is the most important, you wanna play really tight untill you get to late phase of a tourney.
But then again, that just my opinion.