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Finding the Third Proportional to 3,928 and 5,740

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Solution

The third proportional to 3,928 and 5,740 is: 8,387.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928 : 5,740 = 5,740 : x
  2. Step 2: Convert to fraction form
    3,928/5,740 = 5,740/x
  3. Step 3: Cross multiply
    3,928x = 5,740 × 5,740
  4. Step 4: Simplify right side
    3,928x = 32,947,600
  5. Step 5: Solve for x
    x = 32,947,600/3,928
  6. Step 6: Final answer
    x = 8,387.88

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.