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Finding the Fourth Proportional to 321.11, 481.56 and 126.03

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Solution

The fourth proportional to 321.11, 481.56 and 126.03 is: 189.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.11 : 481.56 = 126.03 : x
  2. Step 2: Convert to fraction form
    321.11/481.56 = 126.03/x
  3. Step 3: Cross multiply
    321.11x = 481.56 × 126.03
  4. Step 4: Simplify right side
    321.11x = 60,691.01
  5. Step 5: Solve for x
    x = 60,691.01/321.11
  6. Step 6: Final answer
    x = 189.01

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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.