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Finding the Third Proportional to 3,478 and 4,420

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Solution

The third proportional to 3,478 and 4,420 is: 5,617.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,478 : 4,420 = 4,420 : x
  2. Step 2: Convert to fraction form
    3,478/4,420 = 4,420/x
  3. Step 3: Cross multiply
    3,478x = 4,420 × 4,420
  4. Step 4: Simplify right side
    3,478x = 19,536,400
  5. Step 5: Solve for x
    x = 19,536,400/3,478
  6. Step 6: Final answer
    x = 5,617.14

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.