Question 163277: the average of four numbers is 638.4 the first four numbers are 216 159.8 and 301.25 Find the fourth number.: the average of four numbers is 638.4 the first four numbers are 216 159.8 and 301.25 Find the fourth number. Answer by edjones(2415) (Show Source):
Question 163277: the average of four numbers is 638.4 the first four numbers are 216 159.8 and 301.25 Find the fourth number.: the average of four numbers is 638.4 the first four numbers are 216 159.8 and 301.25 Find the fourth number. Answer by orca(336) (Show Source):
You can put this solution on YOUR website! Let the fourth number be x.
Then the average of the four number can be expressed as:
As the average is 638.4, we have
Solving the equation for x, we obtain (multiply both sides by 4)
