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Finding the Third Proportional to 4,221 and 8,381

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Solution

The third proportional to 4,221 and 8,381 is: 16,640.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,221 : 8,381 = 8,381 : x
  2. Step 2: Convert to fraction form
    4,221/8,381 = 8,381/x
  3. Step 3: Cross multiply
    4,221x = 8,381 × 8,381
  4. Step 4: Simplify right side
    4,221x = 70,241,161
  5. Step 5: Solve for x
    x = 70,241,161/4,221
  6. Step 6: Final answer
    x = 16,640.88

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Why These Related Problems?

These problems maintain the same ratio (1.99) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.