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Finding the Third Proportional to 3,478 and 7,321

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Solution

The third proportional to 3,478 and 7,321 is: 15,410.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,478 : 7,321 = 7,321 : x
  2. Step 2: Convert to fraction form
    3,478/7,321 = 7,321/x
  3. Step 3: Cross multiply
    3,478x = 7,321 × 7,321
  4. Step 4: Simplify right side
    3,478x = 53,597,041
  5. Step 5: Solve for x
    x = 53,597,041/3,478
  6. Step 6: Final answer
    x = 15,410.31

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.