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Finding the Fourth Proportional to 681.65, 1,022.31 and 219.48

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Solution

The fourth proportional to 681.65, 1,022.31 and 219.48 is: 329.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.65 : 1,022.31 = 219.48 : x
  2. Step 2: Convert to fraction form
    681.65/1,022.31 = 219.48/x
  3. Step 3: Cross multiply
    681.65x = 1,022.31 × 219.48
  4. Step 4: Simplify right side
    681.65x = 224,378.52
  5. Step 5: Solve for x
    x = 224,378.52/681.65
  6. Step 6: Final answer
    x = 329.17

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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.