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Finding the Fourth Proportional to 681.28, 1,023.96 and 666.88

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Solution

The fourth proportional to 681.28, 1,023.96 and 666.88 is: 1,002.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.28 : 1,023.96 = 666.88 : x
  2. Step 2: Convert to fraction form
    681.28/1,023.96 = 666.88/x
  3. Step 3: Cross multiply
    681.28x = 1,023.96 × 666.88
  4. Step 4: Simplify right side
    681.28x = 682,858.44
  5. Step 5: Solve for x
    x = 682,858.44/681.28
  6. Step 6: Final answer
    x = 1,002.32

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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.