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Finding the Fourth Proportional to 203.78, 305.26 and 142.62

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Solution

The fourth proportional to 203.78, 305.26 and 142.62 is: 213.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.78 : 305.26 = 142.62 : x
  2. Step 2: Convert to fraction form
    203.78/305.26 = 142.62/x
  3. Step 3: Cross multiply
    203.78x = 305.26 × 142.62
  4. Step 4: Simplify right side
    203.78x = 43,536.18
  5. Step 5: Solve for x
    x = 43,536.18/203.78
  6. Step 6: Final answer
    x = 213.64

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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.