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Finding the Fourth Proportional to 713,431.60, 984,531.72 and 391,155.28

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Solution

The fourth proportional to 713,431.60, 984,531.72 and 391,155.28 is: 539,792.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,431.60 : 984,531.72 = 391,155.28 : x
  2. Step 2: Convert to fraction form
    713,431.60/984,531.72 = 391,155.28/x
  3. Step 3: Cross multiply
    713,431.60x = 984,531.72 × 391,155.28
  4. Step 4: Simplify right side
    713,431.60x = 385,104,780,605.48
  5. Step 5: Solve for x
    x = 385,104,780,605.48/713,431.60
  6. Step 6: Final answer
    x = 539,792.15

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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.