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Finding the Third Proportional to 821.75 and 1,829

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Solution

The third proportional to 821.75 and 1,829 is: 4,070.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.75 : 1,829 = 1,829 : x
  2. Step 2: Convert to fraction form
    821.75/1,829 = 1,829/x
  3. Step 3: Cross multiply
    821.75x = 1,829 × 1,829
  4. Step 4: Simplify right side
    821.75x = 3,345,241
  5. Step 5: Solve for x
    x = 3,345,241/821.75
  6. Step 6: Final answer
    x = 4,070.87

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Why These Related Problems?

These problems maintain the same ratio (2.23) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.