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Finding the Fourth Proportional to 399.87, 551.61 and 252.25

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Solution

The fourth proportional to 399.87, 551.61 and 252.25 is: 347.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.87 : 551.61 = 252.25 : x
  2. Step 2: Convert to fraction form
    399.87/551.61 = 252.25/x
  3. Step 3: Cross multiply
    399.87x = 551.61 × 252.25
  4. Step 4: Simplify right side
    399.87x = 139,142.24
  5. Step 5: Solve for x
    x = 139,142.24/399.87
  6. Step 6: Final answer
    x = 347.97

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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.