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Finding the Fourth Proportional to 415.12, 622.65 and 126.55

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Solution

The fourth proportional to 415.12, 622.65 and 126.55 is: 189.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.12 : 622.65 = 126.55 : x
  2. Step 2: Convert to fraction form
    415.12/622.65 = 126.55/x
  3. Step 3: Cross multiply
    415.12x = 622.65 × 126.55
  4. Step 4: Simplify right side
    415.12x = 78,796.36
  5. Step 5: Solve for x
    x = 78,796.36/415.12
  6. Step 6: Final answer
    x = 189.82

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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.