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Finding the Fourth Proportional to 399.56, 551.31 and 252.11

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Solution

The fourth proportional to 399.56, 551.31 and 252.11 is: 347.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.56 : 551.31 = 252.11 : x
  2. Step 2: Convert to fraction form
    399.56/551.31 = 252.11/x
  3. Step 3: Cross multiply
    399.56x = 551.31 × 252.11
  4. Step 4: Simplify right side
    399.56x = 138,988.10
  5. Step 5: Solve for x
    x = 138,988.10/399.56
  6. Step 6: Final answer
    x = 347.86

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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.