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Finding the Fourth Proportional to 221.19, 331.83 and 76.91

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Solution

The fourth proportional to 221.19, 331.83 and 76.91 is: 115.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.19 : 331.83 = 76.91 : x
  2. Step 2: Convert to fraction form
    221.19/331.83 = 76.91/x
  3. Step 3: Cross multiply
    221.19x = 331.83 × 76.91
  4. Step 4: Simplify right side
    221.19x = 25,521.05
  5. Step 5: Solve for x
    x = 25,521.05/221.19
  6. Step 6: Final answer
    x = 115.38

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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.