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Finding the Fourth Proportional to 658.33, 987.39 and 219.61

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Solution

The fourth proportional to 658.33, 987.39 and 219.61 is: 329.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.33 : 987.39 = 219.61 : x
  2. Step 2: Convert to fraction form
    658.33/987.39 = 219.61/x
  3. Step 3: Cross multiply
    658.33x = 987.39 × 219.61
  4. Step 4: Simplify right side
    658.33x = 216,841.95
  5. Step 5: Solve for x
    x = 216,841.95/658.33
  6. Step 6: Final answer
    x = 329.38

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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.