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Finding the Third Proportional to 5,108 and 7,811

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Solution

The third proportional to 5,108 and 7,811 is: 11,944.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,108 : 7,811 = 7,811 : x
  2. Step 2: Convert to fraction form
    5,108/7,811 = 7,811/x
  3. Step 3: Cross multiply
    5,108x = 7,811 × 7,811
  4. Step 4: Simplify right side
    5,108x = 61,011,721
  5. Step 5: Solve for x
    x = 61,011,721/5,108
  6. Step 6: Final answer
    x = 11,944.35

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.