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Finding the Third Proportional to 3,980 and 7,216

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Solution

The third proportional to 3,980 and 7,216 is: 13,083.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,980 : 7,216 = 7,216 : x
  2. Step 2: Convert to fraction form
    3,980/7,216 = 7,216/x
  3. Step 3: Cross multiply
    3,980x = 7,216 × 7,216
  4. Step 4: Simplify right side
    3,980x = 52,070,656
  5. Step 5: Solve for x
    x = 52,070,656/3,980
  6. Step 6: Final answer
    x = 13,083.08

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Why These Related Problems?

These problems maintain the same ratio (1.81) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.