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Finding the Fourth Proportional to 681.99, 1,023.23 and 219.79

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Solution

The fourth proportional to 681.99, 1,023.23 and 219.79 is: 329.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.99 : 1,023.23 = 219.79 : x
  2. Step 2: Convert to fraction form
    681.99/1,023.23 = 219.79/x
  3. Step 3: Cross multiply
    681.99x = 1,023.23 × 219.79
  4. Step 4: Simplify right side
    681.99x = 224,890.56
  5. Step 5: Solve for x
    x = 224,890.56/681.99
  6. Step 6: Final answer
    x = 329.76

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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.