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Finding the Fourth Proportional to 209.28, 311.92 and 197.52

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Solution

The fourth proportional to 209.28, 311.92 and 197.52 is: 294.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.28 : 311.92 = 197.52 : x
  2. Step 2: Convert to fraction form
    209.28/311.92 = 197.52/x
  3. Step 3: Cross multiply
    209.28x = 311.92 × 197.52
  4. Step 4: Simplify right side
    209.28x = 61,610.44
  5. Step 5: Solve for x
    x = 61,610.44/209.28
  6. Step 6: Final answer
    x = 294.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.