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Finding the Fourth Proportional to 311.55, 467.33 and 138.12

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Solution

The fourth proportional to 311.55, 467.33 and 138.12 is: 207.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.55 : 467.33 = 138.12 : x
  2. Step 2: Convert to fraction form
    311.55/467.33 = 138.12/x
  3. Step 3: Cross multiply
    311.55x = 467.33 × 138.12
  4. Step 4: Simplify right side
    311.55x = 64,546.93
  5. Step 5: Solve for x
    x = 64,546.93/311.55
  6. Step 6: Final answer
    x = 207.18

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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.