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Finding the Third Proportional to 8.72 and 13.36

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Solution

The third proportional to 8.72 and 13.36 is: 20.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.72 : 13.36 = 13.36 : x
  2. Step 2: Convert to fraction form
    8.72/13.36 = 13.36/x
  3. Step 3: Cross multiply
    8.72x = 13.36 × 13.36
  4. Step 4: Simplify right side
    8.72x = 178.47
  5. Step 5: Solve for x
    x = 178.47/8.72
  6. Step 6: Final answer
    x = 20.47

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.