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Finding the Fourth Proportional to 713,578.20, 984,737.43 and 391,293.78

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Solution

The fourth proportional to 713,578.20, 984,737.43 and 391,293.78 is: 539,985.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,578.20 : 984,737.43 = 391,293.78 : x
  2. Step 2: Convert to fraction form
    713,578.20/984,737.43 = 391,293.78/x
  3. Step 3: Cross multiply
    713,578.20x = 984,737.43 × 391,293.78
  4. Step 4: Simplify right side
    713,578.20x = 385,321,631,292.19
  5. Step 5: Solve for x
    x = 385,321,631,292.19/713,578.20
  6. Step 6: Final answer
    x = 539,985.15

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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.