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Finding the Fourth Proportional to 311.01, 428.79 and 223.53

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Solution

The fourth proportional to 311.01, 428.79 and 223.53 is: 308.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.01 : 428.79 = 223.53 : x
  2. Step 2: Convert to fraction form
    311.01/428.79 = 223.53/x
  3. Step 3: Cross multiply
    311.01x = 428.79 × 223.53
  4. Step 4: Simplify right side
    311.01x = 95,847.43
  5. Step 5: Solve for x
    x = 95,847.43/311.01
  6. Step 6: Final answer
    x = 308.18

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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.