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Finding the Fourth Proportional to 578.91, 868.46 and 286.43

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Solution

The fourth proportional to 578.91, 868.46 and 286.43 is: 429.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.91 : 868.46 = 286.43 : x
  2. Step 2: Convert to fraction form
    578.91/868.46 = 286.43/x
  3. Step 3: Cross multiply
    578.91x = 868.46 × 286.43
  4. Step 4: Simplify right side
    578.91x = 248,747.22
  5. Step 5: Solve for x
    x = 248,747.22/578.91
  6. Step 6: Final answer
    x = 429.68

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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.