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Finding the Fourth Proportional to 311.60, 467.50 and 138.20

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Solution

The fourth proportional to 311.60, 467.50 and 138.20 is: 207.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.60 : 467.50 = 138.20 : x
  2. Step 2: Convert to fraction form
    311.60/467.50 = 138.20/x
  3. Step 3: Cross multiply
    311.60x = 467.50 × 138.20
  4. Step 4: Simplify right side
    311.60x = 64,608.50
  5. Step 5: Solve for x
    x = 64,608.50/311.60
  6. Step 6: Final answer
    x = 207.34

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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.