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Finding the Third Proportional to 831 and 1,108

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Solution

The third proportional to 831 and 1,108 is: 1,477.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    831 : 1,108 = 1,108 : x
  2. Step 2: Convert to fraction form
    831/1,108 = 1,108/x
  3. Step 3: Cross multiply
    831x = 1,108 × 1,108
  4. Step 4: Simplify right side
    831x = 1,227,664
  5. Step 5: Solve for x
    x = 1,227,664/831
  6. Step 6: Final answer
    x = 1,477.33

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.