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Finding the Fourth Proportional to 398,900.76, 552,811.89 and 391,331.01

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Solution

The fourth proportional to 398,900.76, 552,811.89 and 391,331.01 is: 542,321.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,900.76 : 552,811.89 = 391,331.01 : x
  2. Step 2: Convert to fraction form
    398,900.76/552,811.89 = 391,331.01/x
  3. Step 3: Cross multiply
    398,900.76x = 552,811.89 × 391,331.01
  4. Step 4: Simplify right side
    398,900.76x = 216,332,435,253.71
  5. Step 5: Solve for x
    x = 216,332,435,253.71/398,900.76
  6. Step 6: Final answer
    x = 542,321.44

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.