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Finding the Fourth Proportional to 668.76, 1,003.02 and 426.96

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Solution

The fourth proportional to 668.76, 1,003.02 and 426.96 is: 640.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.76 : 1,003.02 = 426.96 : x
  2. Step 2: Convert to fraction form
    668.76/1,003.02 = 426.96/x
  3. Step 3: Cross multiply
    668.76x = 1,003.02 × 426.96
  4. Step 4: Simplify right side
    668.76x = 428,249.42
  5. Step 5: Solve for x
    x = 428,249.42/668.76
  6. Step 6: Final answer
    x = 640.36

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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.