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Finding the Fourth Proportional to 203.85, 305.87 and 121.59

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Solution

The fourth proportional to 203.85, 305.87 and 121.59 is: 182.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.85 : 305.87 = 121.59 : x
  2. Step 2: Convert to fraction form
    203.85/305.87 = 121.59/x
  3. Step 3: Cross multiply
    203.85x = 305.87 × 121.59
  4. Step 4: Simplify right side
    203.85x = 37,190.13
  5. Step 5: Solve for x
    x = 37,190.13/203.85
  6. Step 6: Final answer
    x = 182.44

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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.