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Finding the Third Proportional to 3,915 and 7,245

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Solution

The third proportional to 3,915 and 7,245 is: 13,407.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915 : 7,245 = 7,245 : x
  2. Step 2: Convert to fraction form
    3,915/7,245 = 7,245/x
  3. Step 3: Cross multiply
    3,915x = 7,245 × 7,245
  4. Step 4: Simplify right side
    3,915x = 52,490,025
  5. Step 5: Solve for x
    x = 52,490,025/3,915
  6. Step 6: Final answer
    x = 13,407.41

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Why These Related Problems?

These problems maintain the same ratio (1.85) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.