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Finding the Third Proportional to 3,869 and 8,434

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Solution

The third proportional to 3,869 and 8,434 is: 18,385.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,869 : 8,434 = 8,434 : x
  2. Step 2: Convert to fraction form
    3,869/8,434 = 8,434/x
  3. Step 3: Cross multiply
    3,869x = 8,434 × 8,434
  4. Step 4: Simplify right side
    3,869x = 71,132,356
  5. Step 5: Solve for x
    x = 71,132,356/3,869
  6. Step 6: Final answer
    x = 18,385.20

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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.