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Finding the Third Proportional to 3,928 and 4,372

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Solution

The third proportional to 3,928 and 4,372 is: 4,866.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928 : 4,372 = 4,372 : x
  2. Step 2: Convert to fraction form
    3,928/4,372 = 4,372/x
  3. Step 3: Cross multiply
    3,928x = 4,372 × 4,372
  4. Step 4: Simplify right side
    3,928x = 19,114,384
  5. Step 5: Solve for x
    x = 19,114,384/3,928
  6. Step 6: Final answer
    x = 4,866.19

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.