The correct pattern is each term multiplied by 1.5: 40.5×1.5=60.75, 60.75×1.5=91.125, 91.125×1.5=136.6875. However, 18×1.5=27, not 28. Similarly, if 28 were correct, 28×1.5=42, not 40.5. Option A (28) is indeed the wrong term that breaks the ×1.5 pattern.