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Finding the Fourth Proportional to 399.05, 550.70 and 224.38

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Solution

The fourth proportional to 399.05, 550.70 and 224.38 is: 309.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.05 : 550.70 = 224.38 : x
  2. Step 2: Convert to fraction form
    399.05/550.70 = 224.38/x
  3. Step 3: Cross multiply
    399.05x = 550.70 × 224.38
  4. Step 4: Simplify right side
    399.05x = 123,566.07
  5. Step 5: Solve for x
    x = 123,566.07/399.05
  6. Step 6: Final answer
    x = 309.65

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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.