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Finding the Third Proportional to 8.78 and 13.29

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Solution

The third proportional to 8.78 and 13.29 is: 20.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.78 : 13.29 = 13.29 : x
  2. Step 2: Convert to fraction form
    8.78/13.29 = 13.29/x
  3. Step 3: Cross multiply
    8.78x = 13.29 × 13.29
  4. Step 4: Simplify right side
    8.78x = 176.60
  5. Step 5: Solve for x
    x = 176.60/8.78
  6. Step 6: Final answer
    x = 20.11

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.