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Finding the Fourth Proportional to 324.18, 447.22 and 231.13

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Solution

The fourth proportional to 324.18, 447.22 and 231.13 is: 318.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.18 : 447.22 = 231.13 : x
  2. Step 2: Convert to fraction form
    324.18/447.22 = 231.13/x
  3. Step 3: Cross multiply
    324.18x = 447.22 × 231.13
  4. Step 4: Simplify right side
    324.18x = 103,365.96
  5. Step 5: Solve for x
    x = 103,365.96/324.18
  6. Step 6: Final answer
    x = 318.85

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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.