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Finding the Third Proportional to 3,981 and 5,239

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Solution

The third proportional to 3,981 and 5,239 is: 6,894.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,981 : 5,239 = 5,239 : x
  2. Step 2: Convert to fraction form
    3,981/5,239 = 5,239/x
  3. Step 3: Cross multiply
    3,981x = 5,239 × 5,239
  4. Step 4: Simplify right side
    3,981x = 27,447,121
  5. Step 5: Solve for x
    x = 27,447,121/3,981
  6. Step 6: Final answer
    x = 6,894.53

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.