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Finding the Fourth Proportional to 221.21, 331.88 and 118.47

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Solution

The fourth proportional to 221.21, 331.88 and 118.47 is: 177.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.21 : 331.88 = 118.47 : x
  2. Step 2: Convert to fraction form
    221.21/331.88 = 118.47/x
  3. Step 3: Cross multiply
    221.21x = 331.88 × 118.47
  4. Step 4: Simplify right side
    221.21x = 39,317.23
  5. Step 5: Solve for x
    x = 39,317.23/221.21
  6. Step 6: Final answer
    x = 177.74

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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.