CREATE TABLE table_27984 ("#" FLOAT, "Airdate" TEXT, "No. of couples" FLOAT, "1st couple" TEXT, "2nd couple" TEXT, "3rd couple" TEXT, "4th couple" TEXT, "Viewers  ( millions ) " TEXT, "ITV1 weekly ranking" TEXT)

Who were the 3rd couple that were viewed by 4.89 million viewers?
SELECT "3rd couple" FROM table_27984 WHERE "Viewers (millions)" = '4.89'
SELECT "3rd couple" FROM "table_27984" WHERE "Viewers (millions)" = '4.89'