In the following question, select the missing number from the given series.
36, 44, 32
72, 88, 64
54, 66, ?

The numbers can be arranged in a grid of 3 rows and 3 columns:
Row 1: 36, 44, 32
Row 2: 72, 88, 64
Row 3: 54, 66, ?

Let's examine the columns:

Column 1: 36×2=72, and 36×1.5=54

Column 2: 44×2=88, and 44×1.5=66

Column 3: Following the same pattern, Row 2 is Row 1 ×2 (32×2=64).
Row 3 must be Row 1 ×1.5:

32×1.5=48
Therefore, the missing number is 48.