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Finding the Third Proportional to 831 and 1,790

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Solution

The third proportional to 831 and 1,790 is: 3,855.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    831 : 1,790 = 1,790 : x
  2. Step 2: Convert to fraction form
    831/1,790 = 1,790/x
  3. Step 3: Cross multiply
    831x = 1,790 × 1,790
  4. Step 4: Simplify right side
    831x = 3,204,100
  5. Step 5: Solve for x
    x = 3,204,100/831
  6. Step 6: Final answer
    x = 3,855.72

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.