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Finding the Fourth Proportional to 399.09, 551.21 and 267.87

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Solution

The fourth proportional to 399.09, 551.21 and 267.87 is: 369.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.09 : 551.21 = 267.87 : x
  2. Step 2: Convert to fraction form
    399.09/551.21 = 267.87/x
  3. Step 3: Cross multiply
    399.09x = 551.21 × 267.87
  4. Step 4: Simplify right side
    399.09x = 147,653.35
  5. Step 5: Solve for x
    x = 147,653.35/399.09
  6. Step 6: Final answer
    x = 369.97

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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.