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Finding the Fourth Proportional to 817.99, 1,226.09 and 269.78

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Solution

The fourth proportional to 817.99, 1,226.09 and 269.78 is: 404.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.99 : 1,226.09 = 269.78 : x
  2. Step 2: Convert to fraction form
    817.99/1,226.09 = 269.78/x
  3. Step 3: Cross multiply
    817.99x = 1,226.09 × 269.78
  4. Step 4: Simplify right side
    817.99x = 330,769.10
  5. Step 5: Solve for x
    x = 330,769.10/817.99
  6. Step 6: Final answer
    x = 404.37

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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.