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Finding the Fourth Proportional to 627.60, 861.86 and 529.20

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Solution

The fourth proportional to 627.60, 861.86 and 529.20 is: 726.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.60 : 861.86 = 529.20 : x
  2. Step 2: Convert to fraction form
    627.60/861.86 = 529.20/x
  3. Step 3: Cross multiply
    627.60x = 861.86 × 529.20
  4. Step 4: Simplify right side
    627.60x = 456,096.31
  5. Step 5: Solve for x
    x = 456,096.31/627.60
  6. Step 6: Final answer
    x = 726.73

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.