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Finding the Third Proportional to 8,649 and 12,686

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Solution

The third proportional to 8,649 and 12,686 is: 18,607.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,649 : 12,686 = 12,686 : x
  2. Step 2: Convert to fraction form
    8,649/12,686 = 12,686/x
  3. Step 3: Cross multiply
    8,649x = 12,686 × 12,686
  4. Step 4: Simplify right side
    8,649x = 160,934,596
  5. Step 5: Solve for x
    x = 160,934,596/8,649
  6. Step 6: Final answer
    x = 18,607.31

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.