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Finding the Fourth Proportional to 799.26, 1,198.20 and 278.91

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Solution

The fourth proportional to 799.26, 1,198.20 and 278.91 is: 418.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.26 : 1,198.20 = 278.91 : x
  2. Step 2: Convert to fraction form
    799.26/1,198.20 = 278.91/x
  3. Step 3: Cross multiply
    799.26x = 1,198.20 × 278.91
  4. Step 4: Simplify right side
    799.26x = 334,189.96
  5. Step 5: Solve for x
    x = 334,189.96/799.26
  6. Step 6: Final answer
    x = 418.12

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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.