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Finding the Fourth Proportional to 221.08, 331.28 and 118.34

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Solution

The fourth proportional to 221.08, 331.28 and 118.34 is: 177.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.08 : 331.28 = 118.34 : x
  2. Step 2: Convert to fraction form
    221.08/331.28 = 118.34/x
  3. Step 3: Cross multiply
    221.08x = 331.28 × 118.34
  4. Step 4: Simplify right side
    221.08x = 39,203.68
  5. Step 5: Solve for x
    x = 39,203.68/221.08
  6. Step 6: Final answer
    x = 177.33

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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.