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Finding the Fourth Proportional to 798.39, 1,197.92 and 311.78

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Solution

The fourth proportional to 798.39, 1,197.92 and 311.78 is: 467.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.39 : 1,197.92 = 311.78 : x
  2. Step 2: Convert to fraction form
    798.39/1,197.92 = 311.78/x
  3. Step 3: Cross multiply
    798.39x = 1,197.92 × 311.78
  4. Step 4: Simplify right side
    798.39x = 373,491.27
  5. Step 5: Solve for x
    x = 373,491.27/798.39
  6. Step 6: Final answer
    x = 467.81

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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.