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Finding the Fourth Proportional to 528.09, 791.34 and 219.87

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Solution

The fourth proportional to 528.09, 791.34 and 219.87 is: 329.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.09 : 791.34 = 219.87 : x
  2. Step 2: Convert to fraction form
    528.09/791.34 = 219.87/x
  3. Step 3: Cross multiply
    528.09x = 791.34 × 219.87
  4. Step 4: Simplify right side
    528.09x = 173,991.93
  5. Step 5: Solve for x
    x = 173,991.93/528.09
  6. Step 6: Final answer
    x = 329.47

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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.