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Finding the Fourth Proportional to 398.34, 548.73 and 354.11

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Solution

The fourth proportional to 398.34, 548.73 and 354.11 is: 487.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.34 : 548.73 = 354.11 : x
  2. Step 2: Convert to fraction form
    398.34/548.73 = 354.11/x
  3. Step 3: Cross multiply
    398.34x = 548.73 × 354.11
  4. Step 4: Simplify right side
    398.34x = 194,308.04
  5. Step 5: Solve for x
    x = 194,308.04/398.34
  6. Step 6: Final answer
    x = 487.79

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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.