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Finding the Fourth Proportional to 220.65, 330.78 and 83.67

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Solution

The fourth proportional to 220.65, 330.78 and 83.67 is: 125.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.65 : 330.78 = 83.67 : x
  2. Step 2: Convert to fraction form
    220.65/330.78 = 83.67/x
  3. Step 3: Cross multiply
    220.65x = 330.78 × 83.67
  4. Step 4: Simplify right side
    220.65x = 27,676.36
  5. Step 5: Solve for x
    x = 27,676.36/220.65
  6. Step 6: Final answer
    x = 125.43

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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.