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Finding the Fourth Proportional to 627.96, 865.98 and 487.88

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Solution

The fourth proportional to 627.96, 865.98 and 487.88 is: 672.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.96 : 865.98 = 487.88 : x
  2. Step 2: Convert to fraction form
    627.96/865.98 = 487.88/x
  3. Step 3: Cross multiply
    627.96x = 865.98 × 487.88
  4. Step 4: Simplify right side
    627.96x = 422,489.99
  5. Step 5: Solve for x
    x = 422,489.99/627.96
  6. Step 6: Final answer
    x = 672.80

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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.