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Finding the Fourth Proportional to 203.60, 305.28 and 81.84

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Solution

The fourth proportional to 203.60, 305.28 and 81.84 is: 122.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.60 : 305.28 = 81.84 : x
  2. Step 2: Convert to fraction form
    203.60/305.28 = 81.84/x
  3. Step 3: Cross multiply
    203.60x = 305.28 × 81.84
  4. Step 4: Simplify right side
    203.60x = 24,984.12
  5. Step 5: Solve for x
    x = 24,984.12/203.60
  6. Step 6: Final answer
    x = 122.71

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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.