The reigning world champions ended their recent slump with a convincing performance, with goals either side of halftime capping a largely dominant outing
Goals either side of the break from Giampaolo Pazzini and Yuto Nagatomo proved enough to see off the visitors, who have still to win away from home.
Pazzini, who had failed to score in the league since September, finally found the net when racing onto Philippe Coutinho's pass to poke home in the 41st minute. He then provided the pass for Nagatomo to breach the Fiorentina defense four minutes after the break as Inter made the game same with plenty of time to spare.
Pazzini had a glorious opportunity to open the scoring in only the fourth minute after Coutinho drifted into the center and put him through on goal, but the former Fiorentina man could only toe-poke an effort straight at Artur Boruc.
The Brazilian then forced a save from Boruc himself after turning Alessandro Gamberini inside out on the right of the penalty area, unleashing a right-footed effort and the Pole had to get down quickly to keep the effort out.
More great play by Coutinho led to Diego Milito sending in Nagatomo, but again the goalkeeper was alert, forcing the Japanese to settle for a corner.
Inter finally got the lead its play deserved on 41 minutes, and it was almost inevitably Pazzini would be the one to score it. The former Viola striker ghosted in behind Cesare Natali from Coutinho’s lofted pass and poked home superbly ahead of Boruc from a narrow angle.
And four minutes after the interval the lead was doubled, as Nagatomo’s run at the heart of the visitors’ defense resulted in hesitation, leaving the fullback to trot onto the end of Pazzini’s through ball and then tap home unattended.
The introduction of 19-year-old substitute Amidu Salifu helped to perk up Delio Rossi’s side, but Inter continued to make chances.
Substitute Sulley Muntari, Pazzini and Zarate all went close for the home side, while Alberto Gilardino came within a whisker of scoring a consolation effort at the other end.The victory lifts Inter into the top half of the table for the first time this season, climbing into eighth position ahead of Sunday's fixtures. However, it could continue its attempts to claw back territory on the teams above it when it travels to Genoa on Tuesday evening.
Fiorentina remains entrenched in the bottom half, sitting 12th on 16 points. It hosts Atalanta next Saturday needing a win to get back into the race for European football.