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Finding the Fourth Proportional to 399.64, 551.49 and 224.95

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Solution

The fourth proportional to 399.64, 551.49 and 224.95 is: 310.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.64 : 551.49 = 224.95 : x
  2. Step 2: Convert to fraction form
    399.64/551.49 = 224.95/x
  3. Step 3: Cross multiply
    399.64x = 551.49 × 224.95
  4. Step 4: Simplify right side
    399.64x = 124,055.45
  5. Step 5: Solve for x
    x = 124,055.45/399.64
  6. Step 6: Final answer
    x = 310.42

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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.