Problema Solution
the average of four numbers is 638.4 the first three numbers are 216 159.8 and 301.25 find the fourth number
Answer provided by our tutors
Let the 4th number be "x":
(216+159.8+301.25 + x)/4 = 638.4
677.05 + x = 4*638.4
x = 1876.55
Algebrator