ford had 16 rebounds and two steals, including one after his go-ahead basket that set up a jam by Joe Johnson for the final margin.Luol Deng had 15 points, Joakim Noah had 13 points and 12 rebounds and Derrick Rose had 12 points and 12 assists for Chicago.
The Hawks, who were without injured forward Josh Smith, have six straight home wins in the series with the Bulls.
The Hawks cut Chicago's lead to one point at 79-78 on a 3-pointer by Marvin Williams with 1:18 remaining.
Atlanta finally pulled even at 79-all when Horford made one of two free throws with 56 seconds remaining. Noah pushed Chicago's lead back to one point by making one of two free throws with 37 seconds remaining.
Following a timeout, Jamal Crawford drove toward the basket and passed to Horford, whose jam gave Atlanta its first lead at 81-80.
Chicago's Kyle Korver missed a 3-pointer at the final buzzer.
Horford had 13 points in the third quarter as the Hawks cut into Chicago's lead. Johnson, who struggled most of the game, hit a jumper from the corner with 6:22 remaining to trim the lead to 70-69.
Korver answered Johnson's shot with a 3-pointer.
The Bulls established a physical and dominant pace when Noah beat Horford, his former University of Florida teammate, for the opening tipoff.
Rose penetrated and passed to Carlos Boozer, who jammed for the game's first basket. Noah blocked a shot by Horford on the other end, and the Bulls were on their way to the 14-0 run.
Johnson, guarded by Deng much of the game, missed seven of eight shots in the first half. He finished with 12 points on 5-for-20 shooting.
Chicago starters outscored Atlanta's first five 42-16 in the half for a 50-33 lead.