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Finding the Fourth Proportional to 578.82, 868.38 and 426.56

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Solution

The fourth proportional to 578.82, 868.38 and 426.56 is: 639.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.82 : 868.38 = 426.56 : x
  2. Step 2: Convert to fraction form
    578.82/868.38 = 426.56/x
  3. Step 3: Cross multiply
    578.82x = 868.38 × 426.56
  4. Step 4: Simplify right side
    578.82x = 370,416.17
  5. Step 5: Solve for x
    x = 370,416.17/578.82
  6. Step 6: Final answer
    x = 639.95

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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.