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Finding the Fourth Proportional to 221.31, 305.44 and 165.96

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Solution

The fourth proportional to 221.31, 305.44 and 165.96 is: 229.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.31 : 305.44 = 165.96 : x
  2. Step 2: Convert to fraction form
    221.31/305.44 = 165.96/x
  3. Step 3: Cross multiply
    221.31x = 305.44 × 165.96
  4. Step 4: Simplify right side
    221.31x = 50,690.41
  5. Step 5: Solve for x
    x = 50,690.41/221.31
  6. Step 6: Final answer
    x = 229.05

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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.