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Finding the Fourth Proportional to 817.44, 1,227.18 and 813.36

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Solution

The fourth proportional to 817.44, 1,227.18 and 813.36 is: 1,221.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.44 : 1,227.18 = 813.36 : x
  2. Step 2: Convert to fraction form
    817.44/1,227.18 = 813.36/x
  3. Step 3: Cross multiply
    817.44x = 1,227.18 × 813.36
  4. Step 4: Simplify right side
    817.44x = 998,139.12
  5. Step 5: Solve for x
    x = 998,139.12/817.44
  6. Step 6: Final answer
    x = 1,221.05

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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.