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Finding the Fourth Proportional to 658.69, 987.44 and 311.80

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Solution

The fourth proportional to 658.69, 987.44 and 311.80 is: 467.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.69 : 987.44 = 311.80 : x
  2. Step 2: Convert to fraction form
    658.69/987.44 = 311.80/x
  3. Step 3: Cross multiply
    658.69x = 987.44 × 311.80
  4. Step 4: Simplify right side
    658.69x = 307,886.26
  5. Step 5: Solve for x
    x = 307,886.26/658.69
  6. Step 6: Final answer
    x = 467.43

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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.