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Finding the Fourth Proportional to 311.57, 467.36 and 138.12

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Solution

The fourth proportional to 311.57, 467.36 and 138.12 is: 207.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.57 : 467.36 = 138.12 : x
  2. Step 2: Convert to fraction form
    311.57/467.36 = 138.12/x
  3. Step 3: Cross multiply
    311.57x = 467.36 × 138.12
  4. Step 4: Simplify right side
    311.57x = 64,551.76
  5. Step 5: Solve for x
    x = 64,551.76/311.57
  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.