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Finding the Fourth Proportional to 669.64, 1,003.06 and 380.44

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Solution

The fourth proportional to 669.64, 1,003.06 and 380.44 is: 569.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.64 : 1,003.06 = 380.44 : x
  2. Step 2: Convert to fraction form
    669.64/1,003.06 = 380.44/x
  3. Step 3: Cross multiply
    669.64x = 1,003.06 × 380.44
  4. Step 4: Simplify right side
    669.64x = 381,604.15
  5. Step 5: Solve for x
    x = 381,604.15/669.64
  6. Step 6: Final answer
    x = 569.86

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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.