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Finding the Fourth Proportional to 814.56, 1,221.72 and 327.14

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Solution

The fourth proportional to 814.56, 1,221.72 and 327.14 is: 490.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.56 : 1,221.72 = 327.14 : x
  2. Step 2: Convert to fraction form
    814.56/1,221.72 = 327.14/x
  3. Step 3: Cross multiply
    814.56x = 1,221.72 × 327.14
  4. Step 4: Simplify right side
    814.56x = 399,667.37
  5. Step 5: Solve for x
    x = 399,667.37/814.56
  6. Step 6: Final answer
    x = 490.65

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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.