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Finding the Third Proportional to 8,679 and 13,431

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Solution

The third proportional to 8,679 and 13,431 is: 20,784.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679 : 13,431 = 13,431 : x
  2. Step 2: Convert to fraction form
    8,679/13,431 = 13,431/x
  3. Step 3: Cross multiply
    8,679x = 13,431 × 13,431
  4. Step 4: Simplify right side
    8,679x = 180,391,761
  5. Step 5: Solve for x
    x = 180,391,761/8,679
  6. Step 6: Final answer
    x = 20,784.86

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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.