England are 2-0 up in the five-match One-Day International series against Pakistan.
The 2019 World Cup hosts won the third game in Bristol by six wickets, thanks to a commanding century from Jonny Bairstow (128 off 93 balls).
England reached their target of 359 with 31 balls remaining. Jason Roy made 76, Joe Root struck 43, Moeen Ali was 46 not out, and skipper Eoin Morgan unbeaten on 17.
Earlier, Imam-ul-Haq's career-best 151 saw Pakistan to 358 for nine, while fast bowler Chris Woakes took 4-67 for the home side.
The fourth game will be played at Nottingham on Friday.