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Finding the Fourth Proportional to 669.22, 1,003.92 and 395.62

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Solution

The fourth proportional to 669.22, 1,003.92 and 395.62 is: 593.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.22 : 1,003.92 = 395.62 : x
  2. Step 2: Convert to fraction form
    669.22/1,003.92 = 395.62/x
  3. Step 3: Cross multiply
    669.22x = 1,003.92 × 395.62
  4. Step 4: Simplify right side
    669.22x = 397,170.83
  5. Step 5: Solve for x
    x = 397,170.83/669.22
  6. Step 6: Final answer
    x = 593.48

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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.