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Finding the Fourth Proportional to 89,705.39, 133,753.70 and 86,463.90

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Solution

The fourth proportional to 89,705.39, 133,753.70 and 86,463.90 is: 128,920.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,705.39 : 133,753.70 = 86,463.90 : x
  2. Step 2: Convert to fraction form
    89,705.39/133,753.70 = 86,463.90/x
  3. Step 3: Cross multiply
    89,705.39x = 133,753.70 × 86,463.90
  4. Step 4: Simplify right side
    89,705.39x = 11,564,866,757.59
  5. Step 5: Solve for x
    x = 11,564,866,757.59/89,705.39
  6. Step 6: Final answer
    x = 128,920.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.