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Finding the Fourth Proportional to 1,081.05, 1,617.11 and 819.08

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Solution

The fourth proportional to 1,081.05, 1,617.11 and 819.08 is: 1,225.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.05 : 1,617.11 = 819.08 : x
  2. Step 2: Convert to fraction form
    1,081.05/1,617.11 = 819.08/x
  3. Step 3: Cross multiply
    1,081.05x = 1,617.11 × 819.08
  4. Step 4: Simplify right side
    1,081.05x = 1,324,542.46
  5. Step 5: Solve for x
    x = 1,324,542.46/1,081.05
  6. Step 6: Final answer
    x = 1,225.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.