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Finding the Third Proportional to 638.44 and 819.84

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Solution

The third proportional to 638.44 and 819.84 is: 1,052.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.44 : 819.84 = 819.84 : x
  2. Step 2: Convert to fraction form
    638.44/819.84 = 819.84/x
  3. Step 3: Cross multiply
    638.44x = 819.84 × 819.84
  4. Step 4: Simplify right side
    638.44x = 672,143.77
  5. Step 5: Solve for x
    x = 672,143.77/638.44
  6. Step 6: Final answer
    x = 1,052.79

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.