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Finding the Fourth Proportional to 487,564.20, 731,346.30 and 328,131.90

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Solution

The fourth proportional to 487,564.20, 731,346.30 and 328,131.90 is: 492,197.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,564.20 : 731,346.30 = 328,131.90 : x
  2. Step 2: Convert to fraction form
    487,564.20/731,346.30 = 328,131.90/x
  3. Step 3: Cross multiply
    487,564.20x = 731,346.30 × 328,131.90
  4. Step 4: Simplify right side
    487,564.20x = 239,978,050,976.97
  5. Step 5: Solve for x
    x = 239,978,050,976.97/487,564.20
  6. Step 6: Final answer
    x = 492,197.85

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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.