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Finding the Fourth Proportional to 800.78, 1,105.04 and 451.40

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Solution

The fourth proportional to 800.78, 1,105.04 and 451.40 is: 622.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.78 : 1,105.04 = 451.40 : x
  2. Step 2: Convert to fraction form
    800.78/1,105.04 = 451.40/x
  3. Step 3: Cross multiply
    800.78x = 1,105.04 × 451.40
  4. Step 4: Simplify right side
    800.78x = 498,815.06
  5. Step 5: Solve for x
    x = 498,815.06/800.78
  6. Step 6: Final answer
    x = 622.91

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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.