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Finding the Third Proportional to 5,122 and 8,215

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Solution

The third proportional to 5,122 and 8,215 is: 13,175.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,122 : 8,215 = 8,215 : x
  2. Step 2: Convert to fraction form
    5,122/8,215 = 8,215/x
  3. Step 3: Cross multiply
    5,122x = 8,215 × 8,215
  4. Step 4: Simplify right side
    5,122x = 67,486,225
  5. Step 5: Solve for x
    x = 67,486,225/5,122
  6. Step 6: Final answer
    x = 13,175.76

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.