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Finding the Fourth Proportional to 801.16, 1,105.56 and 451.78

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Solution

The fourth proportional to 801.16, 1,105.56 and 451.78 is: 623.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.16 : 1,105.56 = 451.78 : x
  2. Step 2: Convert to fraction form
    801.16/1,105.56 = 451.78/x
  3. Step 3: Cross multiply
    801.16x = 1,105.56 × 451.78
  4. Step 4: Simplify right side
    801.16x = 499,469.90
  5. Step 5: Solve for x
    x = 499,469.90/801.16
  6. Step 6: Final answer
    x = 623.43

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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.