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Finding the Fourth Proportional to 125,156, 172,715.28 and 74,855

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Solution

The fourth proportional to 125,156, 172,715.28 and 74,855 is: 103,299.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,156 : 172,715.28 = 74,855 : x
  2. Step 2: Convert to fraction form
    125,156/172,715.28 = 74,855/x
  3. Step 3: Cross multiply
    125,156x = 172,715.28 × 74,855
  4. Step 4: Simplify right side
    125,156x = 12,928,602,284.40
  5. Step 5: Solve for x
    x = 12,928,602,284.40/125,156
  6. Step 6: Final answer
    x = 103,299.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.