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Finding the Third Proportional to 3,971 and 8,639.50

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Solution

The third proportional to 3,971 and 8,639.50 is: 18,796.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,971 : 8,639.50 = 8,639.50 : x
  2. Step 2: Convert to fraction form
    3,971/8,639.50 = 8,639.50/x
  3. Step 3: Cross multiply
    3,971x = 8,639.50 × 8,639.50
  4. Step 4: Simplify right side
    3,971x = 74,640,960.25
  5. Step 5: Solve for x
    x = 74,640,960.25/3,971
  6. Step 6: Final answer
    x = 18,796.51

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.