Find the missing term in the geometric-like progression: 4, 12, 36, __, 324, 972.

Difficulty: Easy

Correct Answer: 108

Explanation:


Introduction / Context:
This number pattern multiplies each term by a constant factor to obtain the next term. Recognizing the factor allows us to insert the missing value correctly.


Given Data / Assumptions:

  • Sequence: 4, 12, 36, __, 324, 972.
  • Terms appear to grow by a constant ratio.


Concept / Approach:

  • Check ratio: 12/4 = 3, 36/12 = 3.
  • Assume constant ratio 3 continues.


Step-by-Step Solution:

Term 4 = 36 * 3 = 108Check forward: 108 * 3 = 324, 324 * 3 = 972


Verification / Alternative check:
All ratios equal 3; sequence is consistent after inserting 108.


Why Other Options Are Wrong:

  • 125, 215, 312: Do not maintain a constant ratio of 3 throughout.
  • None of these: Not applicable; 108 fits perfectly.


Common Pitfalls:

  • Trying to apply addition instead of multiplication in geometric-like sequences.


Final Answer:
108

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