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Finding the Fourth Proportional to 578.79, 868.10 and 349.20

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Solution

The fourth proportional to 578.79, 868.10 and 349.20 is: 523.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.79 : 868.10 = 349.20 : x
  2. Step 2: Convert to fraction form
    578.79/868.10 = 349.20/x
  3. Step 3: Cross multiply
    578.79x = 868.10 × 349.20
  4. Step 4: Simplify right side
    578.79x = 303,138.77
  5. Step 5: Solve for x
    x = 303,138.77/578.79
  6. Step 6: Final answer
    x = 523.75

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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.