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Finding the Fourth Proportional to 681.61, 1,022.43 and 219.39

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Solution

The fourth proportional to 681.61, 1,022.43 and 219.39 is: 329.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.61 : 1,022.43 = 219.39 : x
  2. Step 2: Convert to fraction form
    681.61/1,022.43 = 219.39/x
  3. Step 3: Cross multiply
    681.61x = 1,022.43 × 219.39
  4. Step 4: Simplify right side
    681.61x = 224,310.92
  5. Step 5: Solve for x
    x = 224,310.92/681.61
  6. Step 6: Final answer
    x = 329.09

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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.