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Finding the Third Proportional to 3,817.50 and 8,211

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Solution

The third proportional to 3,817.50 and 8,211 is: 17,660.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,817.50 : 8,211 = 8,211 : x
  2. Step 2: Convert to fraction form
    3,817.50/8,211 = 8,211/x
  3. Step 3: Cross multiply
    3,817.50x = 8,211 × 8,211
  4. Step 4: Simplify right side
    3,817.50x = 67,420,521
  5. Step 5: Solve for x
    x = 67,420,521/3,817.50
  6. Step 6: Final answer
    x = 17,660.91

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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.