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Finding the Fourth Proportional to 308.66, 425.71 and 198.15

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Solution

The fourth proportional to 308.66, 425.71 and 198.15 is: 273.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.66 : 425.71 = 198.15 : x
  2. Step 2: Convert to fraction form
    308.66/425.71 = 198.15/x
  3. Step 3: Cross multiply
    308.66x = 425.71 × 198.15
  4. Step 4: Simplify right side
    308.66x = 84,351.97
  5. Step 5: Solve for x
    x = 84,351.97/308.66
  6. Step 6: Final answer
    x = 273.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.