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Finding the Fourth Proportional to 667.74, 1,003.50 and 393.96

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Solution

The fourth proportional to 667.74, 1,003.50 and 393.96 is: 592.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.74 : 1,003.50 = 393.96 : x
  2. Step 2: Convert to fraction form
    667.74/1,003.50 = 393.96/x
  3. Step 3: Cross multiply
    667.74x = 1,003.50 × 393.96
  4. Step 4: Simplify right side
    667.74x = 395,338.86
  5. Step 5: Solve for x
    x = 395,338.86/667.74
  6. Step 6: Final answer
    x = 592.06

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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.