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Finding the Fourth Proportional to 798.99, 1,198.28 and 278.91

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Solution

The fourth proportional to 798.99, 1,198.28 and 278.91 is: 418.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.99 : 1,198.28 = 278.91 : x
  2. Step 2: Convert to fraction form
    798.99/1,198.28 = 278.91/x
  3. Step 3: Cross multiply
    798.99x = 1,198.28 × 278.91
  4. Step 4: Simplify right side
    798.99x = 334,212.27
  5. Step 5: Solve for x
    x = 334,212.27/798.99
  6. Step 6: Final answer
    x = 418.29

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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.