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Finding the Fourth Proportional to 392.94, 588.87 and 219.69

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Solution

The fourth proportional to 392.94, 588.87 and 219.69 is: 329.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.94 : 588.87 = 219.69 : x
  2. Step 2: Convert to fraction form
    392.94/588.87 = 219.69/x
  3. Step 3: Cross multiply
    392.94x = 588.87 × 219.69
  4. Step 4: Simplify right side
    392.94x = 129,368.85
  5. Step 5: Solve for x
    x = 129,368.85/392.94
  6. Step 6: Final answer
    x = 329.23

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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.