Multiple choice

Find the missing number in the following number series $4.5 \qquad ? \qquad 6.75 \qquad 13.5 \qquad 33.75 \qquad 101.25$

  1. $4.5$
  2. $4.75$
  3. $5.55$
  4. $5.65$
  5. $5.80$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pattern: each term = previous term × 1.5. 4.5 × 1.5 = 6.75, 6.75 × 1.5 = 10.125 (not 13.5). Let's check forward: 6.75 × 2 = 13.5, 13.5 × 2.5 = 33.75, 33.75 × 3 = 101.25. The multipliers increase by 0.5: 1.5, 2, 2.5, 3. Working backward: 4.5 × 1 = 4.5. The missing number is 4.5.