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Finding the Fourth Proportional to 221.43, 305.44 and 142.72

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Solution

The fourth proportional to 221.43, 305.44 and 142.72 is: 196.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.43 : 305.44 = 142.72 : x
  2. Step 2: Convert to fraction form
    221.43/305.44 = 142.72/x
  3. Step 3: Cross multiply
    221.43x = 305.44 × 142.72
  4. Step 4: Simplify right side
    221.43x = 43,592.40
  5. Step 5: Solve for x
    x = 43,592.40/221.43
  6. Step 6: Final answer
    x = 196.87

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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.