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Finding the Fourth Proportional to 392.47, 589.28 and 219.48

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Solution

The fourth proportional to 392.47, 589.28 and 219.48 is: 329.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.47 : 589.28 = 219.48 : x
  2. Step 2: Convert to fraction form
    392.47/589.28 = 219.48/x
  3. Step 3: Cross multiply
    392.47x = 589.28 × 219.48
  4. Step 4: Simplify right side
    392.47x = 129,335.17
  5. Step 5: Solve for x
    x = 129,335.17/392.47
  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.