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Finding the Fourth Proportional to 399.53, 551.42 and 252.05

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Solution

The fourth proportional to 399.53, 551.42 and 252.05 is: 347.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.53 : 551.42 = 252.05 : x
  2. Step 2: Convert to fraction form
    399.53/551.42 = 252.05/x
  3. Step 3: Cross multiply
    399.53x = 551.42 × 252.05
  4. Step 4: Simplify right side
    399.53x = 138,981.39
  5. Step 5: Solve for x
    x = 138,981.39/399.53
  6. Step 6: Final answer
    x = 347.87

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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.