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Finding the Fourth Proportional to 643,765.62, 888,355.17 and 357,285.90

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Solution

The fourth proportional to 643,765.62, 888,355.17 and 357,285.90 is: 493,031.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,765.62 : 888,355.17 = 357,285.90 : x
  2. Step 2: Convert to fraction form
    643,765.62/888,355.17 = 357,285.90/x
  3. Step 3: Cross multiply
    643,765.62x = 888,355.17 × 357,285.90
  4. Step 4: Simplify right side
    643,765.62x = 317,396,776,433.10
  5. Step 5: Solve for x
    x = 317,396,776,433.10/643,765.62
  6. Step 6: Final answer
    x = 493,031.57

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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.