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Finding the Fourth Proportional to 221.39, 305.09 and 159.11

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Solution

The fourth proportional to 221.39, 305.09 and 159.11 is: 219.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.39 : 305.09 = 159.11 : x
  2. Step 2: Convert to fraction form
    221.39/305.09 = 159.11/x
  3. Step 3: Cross multiply
    221.39x = 305.09 × 159.11
  4. Step 4: Simplify right side
    221.39x = 48,542.87
  5. Step 5: Solve for x
    x = 48,542.87/221.39
  6. Step 6: Final answer
    x = 219.26

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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.