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Finding the Fourth Proportional to 89,780.76, 133,879.10 and 85,365.92

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Solution

The fourth proportional to 89,780.76, 133,879.10 and 85,365.92 is: 127,295.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,780.76 : 133,879.10 = 85,365.92 : x
  2. Step 2: Convert to fraction form
    89,780.76/133,879.10 = 85,365.92/x
  3. Step 3: Cross multiply
    89,780.76x = 133,879.10 × 85,365.92
  4. Step 4: Simplify right side
    89,780.76x = 11,428,711,444.05
  5. Step 5: Solve for x
    x = 11,428,711,444.05/89,780.76
  6. Step 6: Final answer
    x = 127,295.78

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1.5x scale

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.