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Finding the Fourth Proportional to 221.27, 331.91 and 76.99

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Solution

The fourth proportional to 221.27, 331.91 and 76.99 is: 115.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.27 : 331.91 = 76.99 : x
  2. Step 2: Convert to fraction form
    221.27/331.91 = 76.99/x
  3. Step 3: Cross multiply
    221.27x = 331.91 × 76.99
  4. Step 4: Simplify right side
    221.27x = 25,554.81
  5. Step 5: Solve for x
    x = 25,554.81/221.27
  6. Step 6: Final answer
    x = 115.49

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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.