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Finding the Fourth Proportional to 221.38, 305.50 and 126.85

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Solution

The fourth proportional to 221.38, 305.50 and 126.85 is: 175.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.38 : 305.50 = 126.85 : x
  2. Step 2: Convert to fraction form
    221.38/305.50 = 126.85/x
  3. Step 3: Cross multiply
    221.38x = 305.50 × 126.85
  4. Step 4: Simplify right side
    221.38x = 38,752.68
  5. Step 5: Solve for x
    x = 38,752.68/221.38
  6. Step 6: Final answer
    x = 175.05

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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.