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Finding the Fourth Proportional to 399.38, 551.40 and 325.87

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Solution

The fourth proportional to 399.38, 551.40 and 325.87 is: 449.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.38 : 551.40 = 325.87 : x
  2. Step 2: Convert to fraction form
    399.38/551.40 = 325.87/x
  3. Step 3: Cross multiply
    399.38x = 551.40 × 325.87
  4. Step 4: Simplify right side
    399.38x = 179,684.72
  5. Step 5: Solve for x
    x = 179,684.72/399.38
  6. Step 6: Final answer
    x = 449.91

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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.