Ryan Kent headed the home side ahead in the fifth minute – steering an Alfredo Morelos knock-on into the top corner.
The Colombian was clipped down as he hacked back possession and scampered in on goal shortly afterwards but the Rangers captain saw his spot-kick saved by Ross Laidlaw, but nevertheless Filip Helander sent a free header in before Joe Aribo shifted in off the right-wing to thump in a third.
With the home side comfortable Rangers manager Steven Gerrard made a handful of substitutes including Ryan Jack returning to action – and the former Aberdeen man made a real impact and found the net before Connor Goldson headed in the fifth to extend the lead at the top to 23 points.
Here's how the Rangers players rated, using our usual Scotsman.com scale...
Player ratings scale - 10: One of the best performances you've seen. 9: Outstanding. 8: Very good. 7: Good. 6: Average. 5: Poor, 4: Very poor. 3: A terrible day at the office. 2: Abysmal. 1: One of the worst performances you've seen.
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. GLASGOW, SCOTLAND - JANUARY 23: Ryan Jack celebrates after scoring to make it 4-0 Rangers during a Scottish Premiership match between Rangers and Ross County at Ibrox, on January 23, 2021, in Glasgow, Scotland. (Photo by Rob Casey / SNS Group)
Ryan Jack celebrates after scoring to make it 4-0 Rangers during a Scottish Premiership match between Rangers and Ross County at Ibrox, on January 23, 2021, in Glasgow, Scotland. (Photo by Rob Casey / SNS Group) Photo: Rob Casey - SNS Group
. Allan McGregor - 6
Barely any saves to make - but still saw his woodwork hit twice. Another quiet afternoon for the Rangers goalkeeper. Photo: Alan Harvey - SNS Group
. James Tavernier - 6
Captain made way for Nathan Patterson with the game won, but missed penalty in the first half despite a steady positive performance before the break. Photo: Alan Harvey - SNS Group
. Borna Barisic - 7
Left-back's deliveries were typically dangerous and usual high standard attacking performance from the Croat defender. Photo: SNS Group
. Filip Helander - 8
Won't score an easier goal and solid at the back on his return to the team Photo: Rob Casey - SNS Group
17. SUB - Nathan Patterson
On for the final 20 minutes for James Tavernier with the game safe and given experience Photo: SNS Group