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Finding the Third Proportional to 8,918 and 13,872

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Solution

The third proportional to 8,918 and 13,872 is: 21,577.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,918 : 13,872 = 13,872 : x
  2. Step 2: Convert to fraction form
    8,918/13,872 = 13,872/x
  3. Step 3: Cross multiply
    8,918x = 13,872 × 13,872
  4. Step 4: Simplify right side
    8,918x = 192,432,384
  5. Step 5: Solve for x
    x = 192,432,384/8,918
  6. Step 6: Final answer
    x = 21,577.98

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.