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Finding the Third Proportional to 3,964 and 8,418

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Solution

The third proportional to 3,964 and 8,418 is: 17,876.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,964 : 8,418 = 8,418 : x
  2. Step 2: Convert to fraction form
    3,964/8,418 = 8,418/x
  3. Step 3: Cross multiply
    3,964x = 8,418 × 8,418
  4. Step 4: Simplify right side
    3,964x = 70,862,724
  5. Step 5: Solve for x
    x = 70,862,724/3,964
  6. Step 6: Final answer
    x = 17,876.57

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.