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Finding the Third Proportional to 8,515 and 13,218

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Solution

The third proportional to 8,515 and 13,218 is: 20,518.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,515 : 13,218 = 13,218 : x
  2. Step 2: Convert to fraction form
    8,515/13,218 = 13,218/x
  3. Step 3: Cross multiply
    8,515x = 13,218 × 13,218
  4. Step 4: Simplify right side
    8,515x = 174,715,524
  5. Step 5: Solve for x
    x = 174,715,524/8,515
  6. Step 6: Final answer
    x = 20,518.56

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.