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Finding the Fourth Proportional to 90,902.76, 125,456.80 and 52,154.76

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Solution

The fourth proportional to 90,902.76, 125,456.80 and 52,154.76 is: 71,979.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,902.76 : 125,456.80 = 52,154.76 : x
  2. Step 2: Convert to fraction form
    90,902.76/125,456.80 = 52,154.76/x
  3. Step 3: Cross multiply
    90,902.76x = 125,456.80 × 52,154.76
  4. Step 4: Simplify right side
    90,902.76x = 6,543,169,738.40
  5. Step 5: Solve for x
    x = 6,543,169,738.40/90,902.76
  6. Step 6: Final answer
    x = 71,979.88

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1.5x scale

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.