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Finding the Fourth Proportional to 204.09, 305.19 and 142.80

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Solution

The fourth proportional to 204.09, 305.19 and 142.80 is: 213.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.09 : 305.19 = 142.80 : x
  2. Step 2: Convert to fraction form
    204.09/305.19 = 142.80/x
  3. Step 3: Cross multiply
    204.09x = 305.19 × 142.80
  4. Step 4: Simplify right side
    204.09x = 43,581.13
  5. Step 5: Solve for x
    x = 43,581.13/204.09
  6. Step 6: Final answer
    x = 213.54

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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.