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Finding the Fourth Proportional to 802.09, 1,105.82 and 636.85

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Solution

The fourth proportional to 802.09, 1,105.82 and 636.85 is: 878.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.09 : 1,105.82 = 636.85 : x
  2. Step 2: Convert to fraction form
    802.09/1,105.82 = 636.85/x
  3. Step 3: Cross multiply
    802.09x = 1,105.82 × 636.85
  4. Step 4: Simplify right side
    802.09x = 704,238.28
  5. Step 5: Solve for x
    x = 704,238.28/802.09
  6. Step 6: Final answer
    x = 878.00

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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.