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Finding the Fourth Proportional to 394.72, 544.48 and 239.20

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Solution

The fourth proportional to 394.72, 544.48 and 239.20 is: 329.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.72 : 544.48 = 239.20 : x
  2. Step 2: Convert to fraction form
    394.72/544.48 = 239.20/x
  3. Step 3: Cross multiply
    394.72x = 544.48 × 239.20
  4. Step 4: Simplify right side
    394.72x = 130,239.62
  5. Step 5: Solve for x
    x = 130,239.62/394.72
  6. Step 6: Final answer
    x = 329.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.