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Finding the Fourth Proportional to 578.93, 868.61 and 213.96

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Solution

The fourth proportional to 578.93, 868.61 and 213.96 is: 321.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.93 : 868.61 = 213.96 : x
  2. Step 2: Convert to fraction form
    578.93/868.61 = 213.96/x
  3. Step 3: Cross multiply
    578.93x = 868.61 × 213.96
  4. Step 4: Simplify right side
    578.93x = 185,847.80
  5. Step 5: Solve for x
    x = 185,847.80/578.93
  6. Step 6: Final answer
    x = 321.02

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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.