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Finding the Fourth Proportional to 398.95, 550.49 and 224.30

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Solution

The fourth proportional to 398.95, 550.49 and 224.30 is: 309.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.95 : 550.49 = 224.30 : x
  2. Step 2: Convert to fraction form
    398.95/550.49 = 224.30/x
  3. Step 3: Cross multiply
    398.95x = 550.49 × 224.30
  4. Step 4: Simplify right side
    398.95x = 123,475.16
  5. Step 5: Solve for x
    x = 123,475.16/398.95
  6. Step 6: Final answer
    x = 309.50

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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.