# SOLUTION: the average of four numbers is 638.4 the first three numbers are 216,159.8,301.25. what is the fourth number?

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 Click here to see ALL problems on Average Question 507010: the average of four numbers is 638.4 the first three numbers are 216,159.8,301.25. what is the fourth number?Answer by stanbon(57387)   (Show Source): You can put this solution on YOUR website!the average of four numbers is 638.4 the first three numbers are 216,159.8,301.25. what is the fourth number? ---- Let the 4th number be "x": (216+159.8+301.25 + x)/4 = 638.4 ----- 677.05 + x = 4*638.4 x = 1876.55 =========== Cheers, Stan H.