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Finding the Third Proportional to 3,928 and 5,406

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Solution

The third proportional to 3,928 and 5,406 is: 7,440.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928 : 5,406 = 5,406 : x
  2. Step 2: Convert to fraction form
    3,928/5,406 = 5,406/x
  3. Step 3: Cross multiply
    3,928x = 5,406 × 5,406
  4. Step 4: Simplify right side
    3,928x = 29,224,836
  5. Step 5: Solve for x
    x = 29,224,836/3,928
  6. Step 6: Final answer
    x = 7,440.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.