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Finding the Fourth Proportional to 311.36, 467.05 and 80.25

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Solution

The fourth proportional to 311.36, 467.05 and 80.25 is: 120.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.36 : 467.05 = 80.25 : x
  2. Step 2: Convert to fraction form
    311.36/467.05 = 80.25/x
  3. Step 3: Cross multiply
    311.36x = 467.05 × 80.25
  4. Step 4: Simplify right side
    311.36x = 37,480.56
  5. Step 5: Solve for x
    x = 37,480.56/311.36
  6. Step 6: Final answer
    x = 120.38

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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.