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Finding the Third Proportional to 8,702 and 12,687

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Solution

The third proportional to 8,702 and 12,687 is: 18,496.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,702 : 12,687 = 12,687 : x
  2. Step 2: Convert to fraction form
    8,702/12,687 = 12,687/x
  3. Step 3: Cross multiply
    8,702x = 12,687 × 12,687
  4. Step 4: Simplify right side
    8,702x = 160,959,969
  5. Step 5: Solve for x
    x = 160,959,969/8,702
  6. Step 6: Final answer
    x = 18,496.89

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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.