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Finding the Third Proportional to 8.78 and 12.84

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Solution

The third proportional to 8.78 and 12.84 is: 18.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.78 : 12.84 = 12.84 : x
  2. Step 2: Convert to fraction form
    8.78/12.84 = 12.84/x
  3. Step 3: Cross multiply
    8.78x = 12.84 × 12.84
  4. Step 4: Simplify right side
    8.78x = 164.85
  5. Step 5: Solve for x
    x = 164.85/8.78
  6. Step 6: Final answer
    x = 18.77

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.