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Finding the Fourth Proportional to 308.21, 425.45 and 197.84

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Solution

The fourth proportional to 308.21, 425.45 and 197.84 is: 273.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.21 : 425.45 = 197.84 : x
  2. Step 2: Convert to fraction form
    308.21/425.45 = 197.84/x
  3. Step 3: Cross multiply
    308.21x = 425.45 × 197.84
  4. Step 4: Simplify right side
    308.21x = 84,172.59
  5. Step 5: Solve for x
    x = 84,172.59/308.21
  6. Step 6: Final answer
    x = 273.11

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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.