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Finding the Fourth Proportional to 681.71, 1,022.80 and 219.51

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Solution

The fourth proportional to 681.71, 1,022.80 and 219.51 is: 329.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.71 : 1,022.80 = 219.51 : x
  2. Step 2: Convert to fraction form
    681.71/1,022.80 = 219.51/x
  3. Step 3: Cross multiply
    681.71x = 1,022.80 × 219.51
  4. Step 4: Simplify right side
    681.71x = 224,511.27
  5. Step 5: Solve for x
    x = 224,511.27/681.71
  6. Step 6: Final answer
    x = 329.33

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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.