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Finding the Fourth Proportional to 403.14, 604.31 and 385.73

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Solution

The fourth proportional to 403.14, 604.31 and 385.73 is: 578.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.14 : 604.31 = 385.73 : x
  2. Step 2: Convert to fraction form
    403.14/604.31 = 385.73/x
  3. Step 3: Cross multiply
    403.14x = 604.31 × 385.73
  4. Step 4: Simplify right side
    403.14x = 233,095.55
  5. Step 5: Solve for x
    x = 233,095.55/403.14
  6. Step 6: Final answer
    x = 578.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.