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Finding the Fourth Proportional to 311.16, 428.94 and 223.68

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Solution

The fourth proportional to 311.16, 428.94 and 223.68 is: 308.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.16 : 428.94 = 223.68 : x
  2. Step 2: Convert to fraction form
    311.16/428.94 = 223.68/x
  3. Step 3: Cross multiply
    311.16x = 428.94 × 223.68
  4. Step 4: Simplify right side
    311.16x = 95,945.30
  5. Step 5: Solve for x
    x = 95,945.30/311.16
  6. Step 6: Final answer
    x = 308.35

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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.