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Finding the Fourth Proportional to 486,713.61, 729,052.09 and 391,428.76

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Solution

The fourth proportional to 486,713.61, 729,052.09 and 391,428.76 is: 586,324.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,713.61 : 729,052.09 = 391,428.76 : x
  2. Step 2: Convert to fraction form
    486,713.61/729,052.09 = 391,428.76/x
  3. Step 3: Cross multiply
    486,713.61x = 729,052.09 × 391,428.76
  4. Step 4: Simplify right side
    486,713.61x = 285,371,955,564.11
  5. Step 5: Solve for x
    x = 285,371,955,564.11/486,713.61
  6. Step 6: Final answer
    x = 586,324.17

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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.