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Finding the Fourth Proportional to 920.38, 1,380.42 and 270.96

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Solution

The fourth proportional to 920.38, 1,380.42 and 270.96 is: 406.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.38 : 1,380.42 = 270.96 : x
  2. Step 2: Convert to fraction form
    920.38/1,380.42 = 270.96/x
  3. Step 3: Cross multiply
    920.38x = 1,380.42 × 270.96
  4. Step 4: Simplify right side
    920.38x = 374,037.59
  5. Step 5: Solve for x
    x = 374,037.59/920.38
  6. Step 6: Final answer
    x = 406.40

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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.