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Finding the Fourth Proportional to 578.95, 868.29 and 213.78

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Solution

The fourth proportional to 578.95, 868.29 and 213.78 is: 320.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.95 : 868.29 = 213.78 : x
  2. Step 2: Convert to fraction form
    578.95/868.29 = 213.78/x
  3. Step 3: Cross multiply
    578.95x = 868.29 × 213.78
  4. Step 4: Simplify right side
    578.95x = 185,623.04
  5. Step 5: Solve for x
    x = 185,623.04/578.95
  6. Step 6: Final answer
    x = 320.62

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.