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Finding the Fourth Proportional to 392.75, 589.20 and 219.66

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Solution

The fourth proportional to 392.75, 589.20 and 219.66 is: 329.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.75 : 589.20 = 219.66 : x
  2. Step 2: Convert to fraction form
    392.75/589.20 = 219.66/x
  3. Step 3: Cross multiply
    392.75x = 589.20 × 219.66
  4. Step 4: Simplify right side
    392.75x = 129,424.57
  5. Step 5: Solve for x
    x = 129,424.57/392.75
  6. Step 6: Final answer
    x = 329.54

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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.