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Finding the Fourth Proportional to 221.29, 305.26 and 142.56

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Solution

The fourth proportional to 221.29, 305.26 and 142.56 is: 196.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.29 : 305.26 = 142.56 : x
  2. Step 2: Convert to fraction form
    221.29/305.26 = 142.56/x
  3. Step 3: Cross multiply
    221.29x = 305.26 × 142.56
  4. Step 4: Simplify right side
    221.29x = 43,517.87
  5. Step 5: Solve for x
    x = 43,517.87/221.29
  6. Step 6: Final answer
    x = 196.66

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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.