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Finding the Fourth Proportional to 125,251.20, 187,930.80 and 72,705.60

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Solution

The fourth proportional to 125,251.20, 187,930.80 and 72,705.60 is: 109,089.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,251.20 : 187,930.80 = 72,705.60 : x
  2. Step 2: Convert to fraction form
    125,251.20/187,930.80 = 72,705.60/x
  3. Step 3: Cross multiply
    125,251.20x = 187,930.80 × 72,705.60
  4. Step 4: Simplify right side
    125,251.20x = 13,663,621,572.48
  5. Step 5: Solve for x
    x = 13,663,621,572.48/125,251.20
  6. Step 6: Final answer
    x = 109,089.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.