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Finding the Third Proportional to 821 and 911

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Solution

The third proportional to 821 and 911 is: 1,010.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    821 : 911 = 911 : x
  2. Step 2: Convert to fraction form
    821/911 = 911/x
  3. Step 3: Cross multiply
    821x = 911 × 911
  4. Step 4: Simplify right side
    821x = 829,921
  5. Step 5: Solve for x
    x = 829,921/821
  6. Step 6: Final answer
    x = 1,010.87

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.