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Finding the Third Proportional to 8,642 and 13,379

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Solution

The third proportional to 8,642 and 13,379 is: 20,712.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,642 : 13,379 = 13,379 : x
  2. Step 2: Convert to fraction form
    8,642/13,379 = 13,379/x
  3. Step 3: Cross multiply
    8,642x = 13,379 × 13,379
  4. Step 4: Simplify right side
    8,642x = 178,997,641
  5. Step 5: Solve for x
    x = 178,997,641/8,642
  6. Step 6: Final answer
    x = 20,712.52

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.