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Finding the Fourth Proportional to 207.20, 308.74 and 198.48

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Solution

The fourth proportional to 207.20, 308.74 and 198.48 is: 295.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.20 : 308.74 = 198.48 : x
  2. Step 2: Convert to fraction form
    207.20/308.74 = 198.48/x
  3. Step 3: Cross multiply
    207.20x = 308.74 × 198.48
  4. Step 4: Simplify right side
    207.20x = 61,278.72
  5. Step 5: Solve for x
    x = 61,278.72/207.20
  6. Step 6: Final answer
    x = 295.75

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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.