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Finding the Third Proportional to 5.28 and 12.69

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Solution

The third proportional to 5.28 and 12.69 is: 30.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.28 : 12.69 = 12.69 : x
  2. Step 2: Convert to fraction form
    5.28/12.69 = 12.69/x
  3. Step 3: Cross multiply
    5.28x = 12.69 × 12.69
  4. Step 4: Simplify right side
    5.28x = 160.97
  5. Step 5: Solve for x
    x = 160.97/5.28
  6. Step 6: Final answer
    x = 30.48

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Why These Related Problems?

These problems maintain the same ratio (2.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.