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Finding the Fourth Proportional to 221.05, 305.18 and 133.75

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Solution

The fourth proportional to 221.05, 305.18 and 133.75 is: 184.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.05 : 305.18 = 133.75 : x
  2. Step 2: Convert to fraction form
    221.05/305.18 = 133.75/x
  3. Step 3: Cross multiply
    221.05x = 305.18 × 133.75
  4. Step 4: Simplify right side
    221.05x = 40,817.83
  5. Step 5: Solve for x
    x = 40,817.83/221.05
  6. Step 6: Final answer
    x = 184.65

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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.