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Finding the Third Proportional to 8,381 and 12,391

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Solution

The third proportional to 8,381 and 12,391 is: 18,319.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,381 : 12,391 = 12,391 : x
  2. Step 2: Convert to fraction form
    8,381/12,391 = 12,391/x
  3. Step 3: Cross multiply
    8,381x = 12,391 × 12,391
  4. Step 4: Simplify right side
    8,381x = 153,536,881
  5. Step 5: Solve for x
    x = 153,536,881/8,381
  6. Step 6: Final answer
    x = 18,319.64

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.