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Finding the Fourth Proportional to 220.94, 331.42 and 76.67

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Solution

The fourth proportional to 220.94, 331.42 and 76.67 is: 115.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.94 : 331.42 = 76.67 : x
  2. Step 2: Convert to fraction form
    220.94/331.42 = 76.67/x
  3. Step 3: Cross multiply
    220.94x = 331.42 × 76.67
  4. Step 4: Simplify right side
    220.94x = 25,409.97
  5. Step 5: Solve for x
    x = 25,409.97/220.94
  6. Step 6: Final answer
    x = 115.01

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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.