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Finding the Third Proportional to 3,478 and 3,721

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Solution

The third proportional to 3,478 and 3,721 is: 3,980.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,478 : 3,721 = 3,721 : x
  2. Step 2: Convert to fraction form
    3,478/3,721 = 3,721/x
  3. Step 3: Cross multiply
    3,478x = 3,721 × 3,721
  4. Step 4: Simplify right side
    3,478x = 13,845,841
  5. Step 5: Solve for x
    x = 13,845,841/3,478
  6. Step 6: Final answer
    x = 3,980.98

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Why These Related Problems?

These problems maintain the same ratio (1.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.