St Johnstone were unable to take advantage of the few chances that came their way and were punished at Ibrox.
A first half opener from Malik Tillman was followed after the break by finishes from Antonio Colak, Scott Arfield and Tom Lawrence as Rangers picked up a comfortable three points on home soil.
Perth boss Callum Davidson was afforded the opportunity to name the same starting line-up that dramatically defeated Motherwell 2-1 last weekend.
