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Finding the Fourth Proportional to 578.70, 868.59 and 318.86

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Solution

The fourth proportional to 578.70, 868.59 and 318.86 is: 478.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.70 : 868.59 = 318.86 : x
  2. Step 2: Convert to fraction form
    578.70/868.59 = 318.86/x
  3. Step 3: Cross multiply
    578.70x = 868.59 × 318.86
  4. Step 4: Simplify right side
    578.70x = 276,958.61
  5. Step 5: Solve for x
    x = 276,958.61/578.70
  6. Step 6: Final answer
    x = 478.59

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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.