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Finding the Third Proportional to 311.25 and 413.25

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Solution

The third proportional to 311.25 and 413.25 is: 548.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.25 : 413.25 = 413.25 : x
  2. Step 2: Convert to fraction form
    311.25/413.25 = 413.25/x
  3. Step 3: Cross multiply
    311.25x = 413.25 × 413.25
  4. Step 4: Simplify right side
    311.25x = 170,775.56
  5. Step 5: Solve for x
    x = 170,775.56/311.25
  6. Step 6: Final answer
    x = 548.68

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.