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Finding the Fourth Proportional to 221.84, 332.79 and 91.91

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Solution

The fourth proportional to 221.84, 332.79 and 91.91 is: 137.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.84 : 332.79 = 91.91 : x
  2. Step 2: Convert to fraction form
    221.84/332.79 = 91.91/x
  3. Step 3: Cross multiply
    221.84x = 332.79 × 91.91
  4. Step 4: Simplify right side
    221.84x = 30,586.73
  5. Step 5: Solve for x
    x = 30,586.73/221.84
  6. Step 6: Final answer
    x = 137.88

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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.