Answer based on context:

Trying to snap a four-game losing streak, the Rams went home for a Week 12 duel with the Chicago Bears. In the first quarter, St. Louis trailed early as Bears RB Matt Forte got a 13-yard TD run, while QB Kyle Orton completed a 7-yard TD pass to FB Jason McKie. In the second quarter, the Rams' struggles continued as Fort&#233; got a 47-yard TD run.  St. Louis would respond with kicker Josh Brown getting a 43-yard field goal. Chicago would close out the half with Gould making a 43-yard field goal. In the third quarter, the Bears pulled away with Gould nailing a 38-yard field goal. From there on out, Chicago's defense stiffened for the win.

How many more yards was Forte's longest TD run over his shortest one?
34