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Finding the Fourth Proportional to 415.20, 622.84 and 126.56

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Solution

The fourth proportional to 415.20, 622.84 and 126.56 is: 189.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.20 : 622.84 = 126.56 : x
  2. Step 2: Convert to fraction form
    415.20/622.84 = 126.56/x
  3. Step 3: Cross multiply
    415.20x = 622.84 × 126.56
  4. Step 4: Simplify right side
    415.20x = 78,826.63
  5. Step 5: Solve for x
    x = 78,826.63/415.20
  6. Step 6: Final answer
    x = 189.85

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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.