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Finding the Third Proportional to 3,139 and 4,387

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Solution

The third proportional to 3,139 and 4,387 is: 6,131.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139 : 4,387 = 4,387 : x
  2. Step 2: Convert to fraction form
    3,139/4,387 = 4,387/x
  3. Step 3: Cross multiply
    3,139x = 4,387 × 4,387
  4. Step 4: Simplify right side
    3,139x = 19,245,769
  5. Step 5: Solve for x
    x = 19,245,769/3,139
  6. Step 6: Final answer
    x = 6,131.18

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.