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Finding the Third Proportional to 12,708 and 13,908

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Solution

The third proportional to 12,708 and 13,908 is: 15,221.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,708 : 13,908 = 13,908 : x
  2. Step 2: Convert to fraction form
    12,708/13,908 = 13,908/x
  3. Step 3: Cross multiply
    12,708x = 13,908 × 13,908
  4. Step 4: Simplify right side
    12,708x = 193,432,464
  5. Step 5: Solve for x
    x = 193,432,464/12,708
  6. Step 6: Final answer
    x = 15,221.31

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.