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Finding the Fourth Proportional to 90,640.92, 135,982.44 and 89,134.68

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Solution

The fourth proportional to 90,640.92, 135,982.44 and 89,134.68 is: 133,722.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,640.92 : 135,982.44 = 89,134.68 : x
  2. Step 2: Convert to fraction form
    90,640.92/135,982.44 = 89,134.68/x
  3. Step 3: Cross multiply
    90,640.92x = 135,982.44 × 89,134.68
  4. Step 4: Simplify right side
    90,640.92x = 12,120,751,275.02
  5. Step 5: Solve for x
    x = 12,120,751,275.02/90,640.92
  6. Step 6: Final answer
    x = 133,722.73

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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.