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Finding the Fourth Proportional to 681.26, 1,021.22 and 518.60

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Solution

The fourth proportional to 681.26, 1,021.22 and 518.60 is: 777.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.26 : 1,021.22 = 518.60 : x
  2. Step 2: Convert to fraction form
    681.26/1,021.22 = 518.60/x
  3. Step 3: Cross multiply
    681.26x = 1,021.22 × 518.60
  4. Step 4: Simplify right side
    681.26x = 529,604.69
  5. Step 5: Solve for x
    x = 529,604.69/681.26
  6. Step 6: Final answer
    x = 777.39

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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.