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Finding the Fourth Proportional to 801.28, 1,105.86 and 490.84

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Solution

The fourth proportional to 801.28, 1,105.86 and 490.84 is: 677.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.28 : 1,105.86 = 490.84 : x
  2. Step 2: Convert to fraction form
    801.28/1,105.86 = 490.84/x
  3. Step 3: Cross multiply
    801.28x = 1,105.86 × 490.84
  4. Step 4: Simplify right side
    801.28x = 542,800.32
  5. Step 5: Solve for x
    x = 542,800.32/801.28
  6. Step 6: Final answer
    x = 677.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.