header bg

Question:

Continue the pattern: 6, 9, 13.5, 20.25, ?

A 30.375
Explaination

The pattern is the previous number multiplied by 1.5. Therefore, $8198_w87_h14.png$; $3981_w110_h14.png$; $7966_w141_h14.png$; $1096_w160_h14.png$