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Finding the Fourth Proportional to 798.89, 1,198.29 and 278.69

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Solution

The fourth proportional to 798.89, 1,198.29 and 278.69 is: 418.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.89 : 1,198.29 = 278.69 : x
  2. Step 2: Convert to fraction form
    798.89/1,198.29 = 278.69/x
  3. Step 3: Cross multiply
    798.89x = 1,198.29 × 278.69
  4. Step 4: Simplify right side
    798.89x = 333,951.44
  5. Step 5: Solve for x
    x = 333,951.44/798.89
  6. Step 6: Final answer
    x = 418.02

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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.