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Finding the Fourth Proportional to 658.71, 987.98 and 411.93

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Solution

The fourth proportional to 658.71, 987.98 and 411.93 is: 617.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.71 : 987.98 = 411.93 : x
  2. Step 2: Convert to fraction form
    658.71/987.98 = 411.93/x
  3. Step 3: Cross multiply
    658.71x = 987.98 × 411.93
  4. Step 4: Simplify right side
    658.71x = 406,976.54
  5. Step 5: Solve for x
    x = 406,976.54/658.71
  6. Step 6: Final answer
    x = 617.84

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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.