Coming off their road win over the Packers, the Dolphins went home for a Week 7 intraconference duel with the Pittsburgh Steelers.  The Dolphins delivered the opening splash in the first quarter with a 39-yard and a 23-yard field goal from kicker Dan Carpenter.  In the second quarter, the Steelers took the lead with kicker Jeff Reed getting a 22-yard field goal, followed by quarterback Ben Roethlisberger completing a 21-yard touchdown pass to wide receiver Hines Ward.  Miami would respond with Carpenter's 22-yard field goal, but Pittsburgh struck back with Roethlisberger's 53-yard touchdown pass to wide receiver Mike Wallace.  The Dolphins would close out the half as quarterback Chad Henne found wide receiver Davone Bess on a 25-yard touchdown pass. The Steelers added onto their lead in the third quarter as Reed got a 39-yard field goal.  Miami would answer with Carpenter's 37-yard field goal.  The Dolphins regained the lead in the fourth quarter as Carpenter booted a 40-yard field goal, but Pittsburgh answered with Reed making an 18-yard field goal.  The Dolphins tried to rally, but the Steelers' defense held on for the win.
Question: How many yards shorter was Reed's field goal than Carpenter's in the fourth quarter?
Answer: 22