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Finding the Fourth Proportional to 891.12, 1,227.92 and 802.43

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Solution

The fourth proportional to 891.12, 1,227.92 and 802.43 is: 1,105.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.12 : 1,227.92 = 802.43 : x
  2. Step 2: Convert to fraction form
    891.12/1,227.92 = 802.43/x
  3. Step 3: Cross multiply
    891.12x = 1,227.92 × 802.43
  4. Step 4: Simplify right side
    891.12x = 985,319.85
  5. Step 5: Solve for x
    x = 985,319.85/891.12
  6. Step 6: Final answer
    x = 1,105.71

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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.