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Finding the Fourth Proportional to 220.82, 331.36 and 99.11

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Solution

The fourth proportional to 220.82, 331.36 and 99.11 is: 148.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.82 : 331.36 = 99.11 : x
  2. Step 2: Convert to fraction form
    220.82/331.36 = 99.11/x
  3. Step 3: Cross multiply
    220.82x = 331.36 × 99.11
  4. Step 4: Simplify right side
    220.82x = 32,841.67
  5. Step 5: Solve for x
    x = 32,841.67/220.82
  6. Step 6: Final answer
    x = 148.73

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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.