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Finding the Fourth Proportional to 399.12, 550.80 and 222.10

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Solution

The fourth proportional to 399.12, 550.80 and 222.10 is: 306.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.12 : 550.80 = 222.10 : x
  2. Step 2: Convert to fraction form
    399.12/550.80 = 222.10/x
  3. Step 3: Cross multiply
    399.12x = 550.80 × 222.10
  4. Step 4: Simplify right side
    399.12x = 122,332.68
  5. Step 5: Solve for x
    x = 122,332.68/399.12
  6. Step 6: Final answer
    x = 306.51

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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.