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Finding the Third Proportional to 11,691 and 12,879

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Solution

The third proportional to 11,691 and 12,879 is: 14,187.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,691 : 12,879 = 12,879 : x
  2. Step 2: Convert to fraction form
    11,691/12,879 = 12,879/x
  3. Step 3: Cross multiply
    11,691x = 12,879 × 12,879
  4. Step 4: Simplify right side
    11,691x = 165,868,641
  5. Step 5: Solve for x
    x = 165,868,641/11,691
  6. Step 6: Final answer
    x = 14,187.72

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.