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Finding the Third Proportional to 3,947 and 9,138

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Solution

The third proportional to 3,947 and 9,138 is: 21,156.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,947 : 9,138 = 9,138 : x
  2. Step 2: Convert to fraction form
    3,947/9,138 = 9,138/x
  3. Step 3: Cross multiply
    3,947x = 9,138 × 9,138
  4. Step 4: Simplify right side
    3,947x = 83,503,044
  5. Step 5: Solve for x
    x = 83,503,044/3,947
  6. Step 6: Final answer
    x = 21,156.08

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Why These Related Problems?

These problems maintain the same ratio (2.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.