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Finding the Fourth Proportional to 311.57, 467.15 and 126.38

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Solution

The fourth proportional to 311.57, 467.15 and 126.38 is: 189.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.57 : 467.15 = 126.38 : x
  2. Step 2: Convert to fraction form
    311.57/467.15 = 126.38/x
  3. Step 3: Cross multiply
    311.57x = 467.15 × 126.38
  4. Step 4: Simplify right side
    311.57x = 59,039.90
  5. Step 5: Solve for x
    x = 59,039.90/311.57
  6. Step 6: Final answer
    x = 189.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.