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Finding the Fourth Proportional to 311.34, 428.97 and 223.86

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Solution

The fourth proportional to 311.34, 428.97 and 223.86 is: 308.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.34 : 428.97 = 223.86 : x
  2. Step 2: Convert to fraction form
    311.34/428.97 = 223.86/x
  3. Step 3: Cross multiply
    311.34x = 428.97 × 223.86
  4. Step 4: Simplify right side
    311.34x = 96,029.22
  5. Step 5: Solve for x
    x = 96,029.22/311.34
  6. Step 6: Final answer
    x = 308.44

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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.