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Finding the Third Proportional to 318.25 and 670.75

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Solution

The third proportional to 318.25 and 670.75 is: 1,413.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.25 : 670.75 = 670.75 : x
  2. Step 2: Convert to fraction form
    318.25/670.75 = 670.75/x
  3. Step 3: Cross multiply
    318.25x = 670.75 × 670.75
  4. Step 4: Simplify right side
    318.25x = 449,905.56
  5. Step 5: Solve for x
    x = 449,905.56/318.25
  6. Step 6: Final answer
    x = 1,413.69

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.