Select the next number in the series.

Series: 43, 44, 48, 57, 73, ?

Find the differences:

44 − 43 = 1
48 − 44 = 4
57 − 48 = 9
73 − 57 = 16

These are perfect squares:
$1^2, 2^2, 3^2, 4^2$

Next difference:
$5^2 = 25$

So, next term:
$73 + 25 = 98$

Correct answer: 98