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Finding the Fourth Proportional to 681.76, 1,022.56 and 641.68

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Solution

The fourth proportional to 681.76, 1,022.56 and 641.68 is: 962.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.76 : 1,022.56 = 641.68 : x
  2. Step 2: Convert to fraction form
    681.76/1,022.56 = 641.68/x
  3. Step 3: Cross multiply
    681.76x = 1,022.56 × 641.68
  4. Step 4: Simplify right side
    681.76x = 656,156.30
  5. Step 5: Solve for x
    x = 656,156.30/681.76
  6. Step 6: Final answer
    x = 962.44

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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.