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Finding the Fourth Proportional to 464.38, 696.80 and 220.85

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Solution

The fourth proportional to 464.38, 696.80 and 220.85 is: 331.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.38 : 696.80 = 220.85 : x
  2. Step 2: Convert to fraction form
    464.38/696.80 = 220.85/x
  3. Step 3: Cross multiply
    464.38x = 696.80 × 220.85
  4. Step 4: Simplify right side
    464.38x = 153,889.92
  5. Step 5: Solve for x
    x = 153,889.92/464.38
  6. Step 6: Final answer
    x = 331.39

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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.