Rangers received the League 1 trophy after beating Stranraer 3-0 at Ibrox on Saturday as they broke through the 100-point barrier.
Fraser Aird, Arnold Peralta and Dean Shiels got the goals for Ally McCoist’s side, who remain unbeaten in the league this season.
Forfar could still make the play-offs after defeating Ayr United 4-2 at Station Park. Jamie McCluskey, Dale Hilson (2) and Omar Kader were on target, with Michael Moffat (penalty) and Brian Gilmour replying.
Stenhousemuir’s top-four hopes suffered a major blow as they went down 2-1 at home to in-form Airdrieonians. Scott Stewart and Craig Barr struck for the Diamonds before Sean Dickson pulled one back.
Arbroath remain a point adrift at the foot of the table after losing 2-1 to Dunfermline at Gayfield. Andy Geggan grabbed the winner in 79 minutes after Michael Travis had cancelled out a Ryan Thomson goal.
East Fife occupy the relegation play-off place following a 2-1 home defeat to Brechin. Andy Jackson and Alan Trouten scored for City before Pat Clarke reduced the deficit in stoppage time.