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Finding the Fourth Proportional to 798.37, 1,198.67 and 408.65

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Solution

The fourth proportional to 798.37, 1,198.67 and 408.65 is: 613.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.37 : 1,198.67 = 408.65 : x
  2. Step 2: Convert to fraction form
    798.37/1,198.67 = 408.65/x
  3. Step 3: Cross multiply
    798.37x = 1,198.67 × 408.65
  4. Step 4: Simplify right side
    798.37x = 489,836.02
  5. Step 5: Solve for x
    x = 489,836.02/798.37
  6. Step 6: Final answer
    x = 613.55

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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.