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Finding the Third Proportional to 4,147 and 6,421

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Solution

The third proportional to 4,147 and 6,421 is: 9,941.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,147 : 6,421 = 6,421 : x
  2. Step 2: Convert to fraction form
    4,147/6,421 = 6,421/x
  3. Step 3: Cross multiply
    4,147x = 6,421 × 6,421
  4. Step 4: Simplify right side
    4,147x = 41,229,241
  5. Step 5: Solve for x
    x = 41,229,241/4,147
  6. Step 6: Final answer
    x = 9,941.94

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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.