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Finding the Fourth Proportional to 399.23, 550.95 and 219.77

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Solution

The fourth proportional to 399.23, 550.95 and 219.77 is: 303.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.23 : 550.95 = 219.77 : x
  2. Step 2: Convert to fraction form
    399.23/550.95 = 219.77/x
  3. Step 3: Cross multiply
    399.23x = 550.95 × 219.77
  4. Step 4: Simplify right side
    399.23x = 121,078.98
  5. Step 5: Solve for x
    x = 121,078.98/399.23
  6. Step 6: Final answer
    x = 303.28

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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.