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Finding the Third Proportional to 3,916 and 8,378

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Solution

The third proportional to 3,916 and 8,378 is: 17,924.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,916 : 8,378 = 8,378 : x
  2. Step 2: Convert to fraction form
    3,916/8,378 = 8,378/x
  3. Step 3: Cross multiply
    3,916x = 8,378 × 8,378
  4. Step 4: Simplify right side
    3,916x = 70,190,884
  5. Step 5: Solve for x
    x = 70,190,884/3,916
  6. Step 6: Final answer
    x = 17,924.13

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.