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Finding the Fourth Proportional to 399.92, 551.90 and 234.12

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Solution

The fourth proportional to 399.92, 551.90 and 234.12 is: 323.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.92 : 551.90 = 234.12 : x
  2. Step 2: Convert to fraction form
    399.92/551.90 = 234.12/x
  3. Step 3: Cross multiply
    399.92x = 551.90 × 234.12
  4. Step 4: Simplify right side
    399.92x = 129,209.66
  5. Step 5: Solve for x
    x = 129,209.66/399.92
  6. Step 6: Final answer
    x = 323.09

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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.