Find the missing number 50,51,77.5,156,391,____

Answer 1

First differences Second differences Third Differences Fourth Difference

51 - 50 = 1 26.5-1 = 25.5

77.5 - 51 = 26.5 78.5 - 26.5 = 52 52 - 25.5 = 26.5

156 - 77.5 = 78.5 235 -78.5 = 156.5 156.5 - 52 = 104.5 104.5 -26.5 = 78

391 - 156 = 235

So then adding the third difference 104.5 + 78 = 182.5

Adds that to the second difference: 156.5 + 182.5 = 339

Adds that to the first difference: 235 + 339 = 574