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Finding the Fourth Proportional to 221.37, 331.79 and 91.37

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Solution

The fourth proportional to 221.37, 331.79 and 91.37 is: 136.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.37 : 331.79 = 91.37 : x
  2. Step 2: Convert to fraction form
    221.37/331.79 = 91.37/x
  3. Step 3: Cross multiply
    221.37x = 331.79 × 91.37
  4. Step 4: Simplify right side
    221.37x = 30,313.54
  5. Step 5: Solve for x
    x = 30,313.54/221.37
  6. Step 6: Final answer
    x = 136.94

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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.