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Finding the Third Proportional to 3,971 and 7,078

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Solution

The third proportional to 3,971 and 7,078 is: 12,615.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,971 : 7,078 = 7,078 : x
  2. Step 2: Convert to fraction form
    3,971/7,078 = 7,078/x
  3. Step 3: Cross multiply
    3,971x = 7,078 × 7,078
  4. Step 4: Simplify right side
    3,971x = 50,098,084
  5. Step 5: Solve for x
    x = 50,098,084/3,971
  6. Step 6: Final answer
    x = 12,615.99

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.