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Finding the Third Proportional to 318.94 and 685.97

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Solution

The third proportional to 318.94 and 685.97 is: 1,475.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.94 : 685.97 = 685.97 : x
  2. Step 2: Convert to fraction form
    318.94/685.97 = 685.97/x
  3. Step 3: Cross multiply
    318.94x = 685.97 × 685.97
  4. Step 4: Simplify right side
    318.94x = 470,553.13
  5. Step 5: Solve for x
    x = 470,553.13/318.94
  6. Step 6: Final answer
    x = 1,475.38

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.