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Finding the Fourth Proportional to 627.95, 865.96 and 487.82

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Solution

The fourth proportional to 627.95, 865.96 and 487.82 is: 672.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.95 : 865.96 = 487.82 : x
  2. Step 2: Convert to fraction form
    627.95/865.96 = 487.82/x
  3. Step 3: Cross multiply
    627.95x = 865.96 × 487.82
  4. Step 4: Simplify right side
    627.95x = 422,433.55
  5. Step 5: Solve for x
    x = 422,433.55/627.95
  6. Step 6: Final answer
    x = 672.72

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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.