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Finding the Fourth Proportional to 221.53, 331.98 and 113.38

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Solution

The fourth proportional to 221.53, 331.98 and 113.38 is: 169.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.53 : 331.98 = 113.38 : x
  2. Step 2: Convert to fraction form
    221.53/331.98 = 113.38/x
  3. Step 3: Cross multiply
    221.53x = 331.98 × 113.38
  4. Step 4: Simplify right side
    221.53x = 37,639.89
  5. Step 5: Solve for x
    x = 37,639.89/221.53
  6. Step 6: Final answer
    x = 169.91

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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.