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Finding the Third Proportional to 2,578 and 3,940

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Solution

The third proportional to 2,578 and 3,940 is: 6,021.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,578 : 3,940 = 3,940 : x
  2. Step 2: Convert to fraction form
    2,578/3,940 = 3,940/x
  3. Step 3: Cross multiply
    2,578x = 3,940 × 3,940
  4. Step 4: Simplify right side
    2,578x = 15,523,600
  5. Step 5: Solve for x
    x = 15,523,600/2,578
  6. Step 6: Final answer
    x = 6,021.57

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.