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Finding the Fourth Proportional to 311.60, 426.46 and 308.36

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Solution

The fourth proportional to 311.60, 426.46 and 308.36 is: 422.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.60 : 426.46 = 308.36 : x
  2. Step 2: Convert to fraction form
    311.60/426.46 = 308.36/x
  3. Step 3: Cross multiply
    311.60x = 426.46 × 308.36
  4. Step 4: Simplify right side
    311.60x = 131,503.21
  5. Step 5: Solve for x
    x = 131,503.21/311.60
  6. Step 6: Final answer
    x = 422.03

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.