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Finding the Third Proportional to 3,928 and 8,390

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Solution

The third proportional to 3,928 and 8,390 is: 17,920.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928 : 8,390 = 8,390 : x
  2. Step 2: Convert to fraction form
    3,928/8,390 = 8,390/x
  3. Step 3: Cross multiply
    3,928x = 8,390 × 8,390
  4. Step 4: Simplify right side
    3,928x = 70,392,100
  5. Step 5: Solve for x
    x = 70,392,100/3,928
  6. Step 6: Final answer
    x = 17,920.60

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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.