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Finding the Fourth Proportional to 399.71, 551.49 and 252.53

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Solution

The fourth proportional to 399.71, 551.49 and 252.53 is: 348.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.71 : 551.49 = 252.53 : x
  2. Step 2: Convert to fraction form
    399.71/551.49 = 252.53/x
  3. Step 3: Cross multiply
    399.71x = 551.49 × 252.53
  4. Step 4: Simplify right side
    399.71x = 139,267.77
  5. Step 5: Solve for x
    x = 139,267.77/399.71
  6. Step 6: Final answer
    x = 348.42

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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.