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Finding the Third Proportional to 3,140 and 3,980

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Solution

The third proportional to 3,140 and 3,980 is: 5,044.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,140 : 3,980 = 3,980 : x
  2. Step 2: Convert to fraction form
    3,140/3,980 = 3,980/x
  3. Step 3: Cross multiply
    3,140x = 3,980 × 3,980
  4. Step 4: Simplify right side
    3,140x = 15,840,400
  5. Step 5: Solve for x
    x = 15,840,400/3,140
  6. Step 6: Final answer
    x = 5,044.71

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.