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Finding the Fourth Proportional to 800.22, 1,103.31 and 660.90

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Solution

The fourth proportional to 800.22, 1,103.31 and 660.90 is: 911.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.22 : 1,103.31 = 660.90 : x
  2. Step 2: Convert to fraction form
    800.22/1,103.31 = 660.90/x
  3. Step 3: Cross multiply
    800.22x = 1,103.31 × 660.90
  4. Step 4: Simplify right side
    800.22x = 729,177.58
  5. Step 5: Solve for x
    x = 729,177.58/800.22
  6. Step 6: Final answer
    x = 911.22

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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.