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Finding the Fourth Proportional to 548.12, 755.91 and 398.44

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Solution

The fourth proportional to 548.12, 755.91 and 398.44 is: 549.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.12 : 755.91 = 398.44 : x
  2. Step 2: Convert to fraction form
    548.12/755.91 = 398.44/x
  3. Step 3: Cross multiply
    548.12x = 755.91 × 398.44
  4. Step 4: Simplify right side
    548.12x = 301,186.73
  5. Step 5: Solve for x
    x = 301,186.73/548.12
  6. Step 6: Final answer
    x = 549.49

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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.