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Finding the Fourth Proportional to 398.30, 553.34 and 394.74

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Solution

The fourth proportional to 398.30, 553.34 and 394.74 is: 548.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.30 : 553.34 = 394.74 : x
  2. Step 2: Convert to fraction form
    398.30/553.34 = 394.74/x
  3. Step 3: Cross multiply
    398.30x = 553.34 × 394.74
  4. Step 4: Simplify right side
    398.30x = 218,425.43
  5. Step 5: Solve for x
    x = 218,425.43/398.30
  6. Step 6: Final answer
    x = 548.39

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.