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Finding the Fourth Proportional to 798.91, 1,198.43 and 278.86

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Solution

The fourth proportional to 798.91, 1,198.43 and 278.86 is: 418.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.91 : 1,198.43 = 278.86 : x
  2. Step 2: Convert to fraction form
    798.91/1,198.43 = 278.86/x
  3. Step 3: Cross multiply
    798.91x = 1,198.43 × 278.86
  4. Step 4: Simplify right side
    798.91x = 334,194.19
  5. Step 5: Solve for x
    x = 334,194.19/798.91
  6. Step 6: Final answer
    x = 418.31

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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.