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Finding the Third Proportional to 3,311 and 5,131

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Solution

The third proportional to 3,311 and 5,131 is: 7,951.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,311 : 5,131 = 5,131 : x
  2. Step 2: Convert to fraction form
    3,311/5,131 = 5,131/x
  3. Step 3: Cross multiply
    3,311x = 5,131 × 5,131
  4. Step 4: Simplify right side
    3,311x = 26,327,161
  5. Step 5: Solve for x
    x = 26,327,161/3,311
  6. Step 6: Final answer
    x = 7,951.42

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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.