Reading eased past Derby County at Pride Park but were relegated from the Barclays Premier League.
James Harper curled home his sixth goal of the season to hand the Royals a deserved half-time lead and Dave Kitson, Kevin Doyle and Leroy Lita were all on target after the break.
However, Fulham's victory at Portsmouth took their fate out of their own hands and the Royals will join Derby and Birmingham City in the second tier next season.
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