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Finding the Fourth Proportional to 221.18, 331.81 and 118.58

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Solution

The fourth proportional to 221.18, 331.81 and 118.58 is: 177.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.18 : 331.81 = 118.58 : x
  2. Step 2: Convert to fraction form
    221.18/331.81 = 118.58/x
  3. Step 3: Cross multiply
    221.18x = 331.81 × 118.58
  4. Step 4: Simplify right side
    221.18x = 39,344.71
  5. Step 5: Solve for x
    x = 39,344.71/221.18
  6. Step 6: Final answer
    x = 177.89

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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.