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Finding the Fourth Proportional to 399.48, 551.35 and 239.92

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Solution

The fourth proportional to 399.48, 551.35 and 239.92 is: 331.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.48 : 551.35 = 239.92 : x
  2. Step 2: Convert to fraction form
    399.48/551.35 = 239.92/x
  3. Step 3: Cross multiply
    399.48x = 551.35 × 239.92
  4. Step 4: Simplify right side
    399.48x = 132,277.36
  5. Step 5: Solve for x
    x = 132,277.36/399.48
  6. Step 6: Final answer
    x = 331.13

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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.