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Finding the Third Proportional to 3,915 and 7,329

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Solution

The third proportional to 3,915 and 7,329 is: 13,720.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915 : 7,329 = 7,329 : x
  2. Step 2: Convert to fraction form
    3,915/7,329 = 7,329/x
  3. Step 3: Cross multiply
    3,915x = 7,329 × 7,329
  4. Step 4: Simplify right side
    3,915x = 53,714,241
  5. Step 5: Solve for x
    x = 53,714,241/3,915
  6. Step 6: Final answer
    x = 13,720.11

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Why These Related Problems?

These problems maintain the same ratio (1.87) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.