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Finding the Fourth Proportional to 319.85, 440.96 and 231.26

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Solution

The fourth proportional to 319.85, 440.96 and 231.26 is: 318.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.85 : 440.96 = 231.26 : x
  2. Step 2: Convert to fraction form
    319.85/440.96 = 231.26/x
  3. Step 3: Cross multiply
    319.85x = 440.96 × 231.26
  4. Step 4: Simplify right side
    319.85x = 101,974.78
  5. Step 5: Solve for x
    x = 101,974.78/319.85
  6. Step 6: Final answer
    x = 318.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.