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Finding the Third Proportional to 8.38 and 12.88

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Solution

The third proportional to 8.38 and 12.88 is: 19.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.38 : 12.88 = 12.88 : x
  2. Step 2: Convert to fraction form
    8.38/12.88 = 12.88/x
  3. Step 3: Cross multiply
    8.38x = 12.88 × 12.88
  4. Step 4: Simplify right side
    8.38x = 165.77
  5. Step 5: Solve for x
    x = 165.77/8.38
  6. Step 6: Final answer
    x = 19.79

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.