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Finding the Fourth Proportional to 681.26, 1,020.20 and 333.47

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Solution

The fourth proportional to 681.26, 1,020.20 and 333.47 is: 499.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.26 : 1,020.20 = 333.47 : x
  2. Step 2: Convert to fraction form
    681.26/1,020.20 = 333.47/x
  3. Step 3: Cross multiply
    681.26x = 1,020.20 × 333.47
  4. Step 4: Simplify right side
    681.26x = 340,201.83
  5. Step 5: Solve for x
    x = 340,201.83/681.26
  6. Step 6: Final answer
    x = 499.38

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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.