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Finding the Fourth Proportional to 528.28, 791.70 and 219.67

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Solution

The fourth proportional to 528.28, 791.70 and 219.67 is: 329.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.28 : 791.70 = 219.67 : x
  2. Step 2: Convert to fraction form
    528.28/791.70 = 219.67/x
  3. Step 3: Cross multiply
    528.28x = 791.70 × 219.67
  4. Step 4: Simplify right side
    528.28x = 173,912.74
  5. Step 5: Solve for x
    x = 173,912.74/528.28
  6. Step 6: Final answer
    x = 329.21

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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.