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Finding the Fourth Proportional to 658.82, 987.81 and 311.94

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Solution

The fourth proportional to 658.82, 987.81 and 311.94 is: 467.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.82 : 987.81 = 311.94 : x
  2. Step 2: Convert to fraction form
    658.82/987.81 = 311.94/x
  3. Step 3: Cross multiply
    658.82x = 987.81 × 311.94
  4. Step 4: Simplify right side
    658.82x = 308,137.45
  5. Step 5: Solve for x
    x = 308,137.45/658.82
  6. Step 6: Final answer
    x = 467.71

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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.