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Finding the Third Proportional to 3,940 and 8,515

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Solution

The third proportional to 3,940 and 8,515 is: 18,402.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940 : 8,515 = 8,515 : x
  2. Step 2: Convert to fraction form
    3,940/8,515 = 8,515/x
  3. Step 3: Cross multiply
    3,940x = 8,515 × 8,515
  4. Step 4: Simplify right side
    3,940x = 72,505,225
  5. Step 5: Solve for x
    x = 72,505,225/3,940
  6. Step 6: Final answer
    x = 18,402.34

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.