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Finding the Fourth Proportional to 311.50, 467.25 and 83.50

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Solution

The fourth proportional to 311.50, 467.25 and 83.50 is: 125.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.50 : 467.25 = 83.50 : x
  2. Step 2: Convert to fraction form
    311.50/467.25 = 83.50/x
  3. Step 3: Cross multiply
    311.50x = 467.25 × 83.50
  4. Step 4: Simplify right side
    311.50x = 39,015.38
  5. Step 5: Solve for x
    x = 39,015.38/311.50
  6. Step 6: Final answer
    x = 125.25

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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.