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Finding the Fourth Proportional to 639.12, 881.52 and 449.76

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Solution

The fourth proportional to 639.12, 881.52 and 449.76 is: 620.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.12 : 881.52 = 449.76 : x
  2. Step 2: Convert to fraction form
    639.12/881.52 = 449.76/x
  3. Step 3: Cross multiply
    639.12x = 881.52 × 449.76
  4. Step 4: Simplify right side
    639.12x = 396,472.44
  5. Step 5: Solve for x
    x = 396,472.44/639.12
  6. Step 6: Final answer
    x = 620.34

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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.