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Finding the Third Proportional to 3,992 and 5,216

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Solution

The third proportional to 3,992 and 5,216 is: 6,815.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,992 : 5,216 = 5,216 : x
  2. Step 2: Convert to fraction form
    3,992/5,216 = 5,216/x
  3. Step 3: Cross multiply
    3,992x = 5,216 × 5,216
  4. Step 4: Simplify right side
    3,992x = 27,206,656
  5. Step 5: Solve for x
    x = 27,206,656/3,992
  6. Step 6: Final answer
    x = 6,815.29

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.