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Finding the Fourth Proportional to 814.69, 1,220.81 and 327.47

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Solution

The fourth proportional to 814.69, 1,220.81 and 327.47 is: 490.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.69 : 1,220.81 = 327.47 : x
  2. Step 2: Convert to fraction form
    814.69/1,220.81 = 327.47/x
  3. Step 3: Cross multiply
    814.69x = 1,220.81 × 327.47
  4. Step 4: Simplify right side
    814.69x = 399,778.65
  5. Step 5: Solve for x
    x = 399,778.65/814.69
  6. Step 6: Final answer
    x = 490.72

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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.