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Finding the Third Proportional to 339 and 400.31

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Solution

The third proportional to 339 and 400.31 is: 472.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    339 : 400.31 = 400.31 : x
  2. Step 2: Convert to fraction form
    339/400.31 = 400.31/x
  3. Step 3: Cross multiply
    339x = 400.31 × 400.31
  4. Step 4: Simplify right side
    339x = 160,250.10
  5. Step 5: Solve for x
    x = 160,250.10/339
  6. Step 6: Final answer
    x = 472.71

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.