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Finding the Fourth Proportional to 920.28, 1,380.56 and 426.48

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Solution

The fourth proportional to 920.28, 1,380.56 and 426.48 is: 639.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.28 : 1,380.56 = 426.48 : x
  2. Step 2: Convert to fraction form
    920.28/1,380.56 = 426.48/x
  3. Step 3: Cross multiply
    920.28x = 1,380.56 × 426.48
  4. Step 4: Simplify right side
    920.28x = 588,781.23
  5. Step 5: Solve for x
    x = 588,781.23/920.28
  6. Step 6: Final answer
    x = 639.78

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1.5x scale

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.