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Finding the Fourth Proportional to 399.92, 551.42 and 300.47

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Solution

The fourth proportional to 399.92, 551.42 and 300.47 is: 414.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.92 : 551.42 = 300.47 : x
  2. Step 2: Convert to fraction form
    399.92/551.42 = 300.47/x
  3. Step 3: Cross multiply
    399.92x = 551.42 × 300.47
  4. Step 4: Simplify right side
    399.92x = 165,680.91
  5. Step 5: Solve for x
    x = 165,680.91/399.92
  6. Step 6: Final answer
    x = 414.29

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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.