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Finding the Fourth Proportional to 801.44, 1,105.44 and 490.40

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Solution

The fourth proportional to 801.44, 1,105.44 and 490.40 is: 676.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.44 : 1,105.44 = 490.40 : x
  2. Step 2: Convert to fraction form
    801.44/1,105.44 = 490.40/x
  3. Step 3: Cross multiply
    801.44x = 1,105.44 × 490.40
  4. Step 4: Simplify right side
    801.44x = 542,107.78
  5. Step 5: Solve for x
    x = 542,107.78/801.44
  6. Step 6: Final answer
    x = 676.42

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1.5x scale

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.