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Finding the Third Proportional to 1,938 and 4,040

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Solution

The third proportional to 1,938 and 4,040 is: 8,421.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938 : 4,040 = 4,040 : x
  2. Step 2: Convert to fraction form
    1,938/4,040 = 4,040/x
  3. Step 3: Cross multiply
    1,938x = 4,040 × 4,040
  4. Step 4: Simplify right side
    1,938x = 16,321,600
  5. Step 5: Solve for x
    x = 16,321,600/1,938
  6. Step 6: Final answer
    x = 8,421.88

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.