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Finding the Fourth Proportional to 709,728, 979,425.28 and 391,776

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Solution

The fourth proportional to 709,728, 979,425.28 and 391,776 is: 540,651.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,728 : 979,425.28 = 391,776 : x
  2. Step 2: Convert to fraction form
    709,728/979,425.28 = 391,776/x
  3. Step 3: Cross multiply
    709,728x = 979,425.28 × 391,776
  4. Step 4: Simplify right side
    709,728x = 383,715,318,497.28
  5. Step 5: Solve for x
    x = 383,715,318,497.28/709,728
  6. Step 6: Final answer
    x = 540,651.23

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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.