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Finding the Fourth Proportional to 398.94, 550.26 and 385.56

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Solution

The fourth proportional to 398.94, 550.26 and 385.56 is: 531.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.94 : 550.26 = 385.56 : x
  2. Step 2: Convert to fraction form
    398.94/550.26 = 385.56/x
  3. Step 3: Cross multiply
    398.94x = 550.26 × 385.56
  4. Step 4: Simplify right side
    398.94x = 212,158.25
  5. Step 5: Solve for x
    x = 212,158.25/398.94
  6. Step 6: Final answer
    x = 531.80

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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.