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Finding the Third Proportional to 2,980 and 3,918

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Solution

The third proportional to 2,980 and 3,918 is: 5,151.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,980 : 3,918 = 3,918 : x
  2. Step 2: Convert to fraction form
    2,980/3,918 = 3,918/x
  3. Step 3: Cross multiply
    2,980x = 3,918 × 3,918
  4. Step 4: Simplify right side
    2,980x = 15,350,724
  5. Step 5: Solve for x
    x = 15,350,724/2,980
  6. Step 6: Final answer
    x = 5,151.25

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.