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Finding the Fourth Proportional to 578.95, 868.42 and 213.84

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Solution

The fourth proportional to 578.95, 868.42 and 213.84 is: 320.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.95 : 868.42 = 213.84 : x
  2. Step 2: Convert to fraction form
    578.95/868.42 = 213.84/x
  3. Step 3: Cross multiply
    578.95x = 868.42 × 213.84
  4. Step 4: Simplify right side
    578.95x = 185,702.40
  5. Step 5: Solve for x
    x = 185,702.40/578.95
  6. Step 6: Final answer
    x = 320.76

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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.