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Finding the Fourth Proportional to 399.78, 551.66 and 294.92

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Solution

The fourth proportional to 399.78, 551.66 and 294.92 is: 406.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.78 : 551.66 = 294.92 : x
  2. Step 2: Convert to fraction form
    399.78/551.66 = 294.92/x
  3. Step 3: Cross multiply
    399.78x = 551.66 × 294.92
  4. Step 4: Simplify right side
    399.78x = 162,697.06
  5. Step 5: Solve for x
    x = 162,697.06/399.78
  6. Step 6: Final answer
    x = 406.97

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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.