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Finding the Fourth Proportional to 398.53, 550.24 and 305.11

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Solution

The fourth proportional to 398.53, 550.24 and 305.11 is: 421.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.53 : 550.24 = 305.11 : x
  2. Step 2: Convert to fraction form
    398.53/550.24 = 305.11/x
  3. Step 3: Cross multiply
    398.53x = 550.24 × 305.11
  4. Step 4: Simplify right side
    398.53x = 167,879.45
  5. Step 5: Solve for x
    x = 167,879.45/398.53
  6. Step 6: Final answer
    x = 421.25

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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.