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Finding the Fourth Proportional to 415.09, 622.64 and 126.54

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Solution

The fourth proportional to 415.09, 622.64 and 126.54 is: 189.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.09 : 622.64 = 126.54 : x
  2. Step 2: Convert to fraction form
    415.09/622.64 = 126.54/x
  3. Step 3: Cross multiply
    415.09x = 622.64 × 126.54
  4. Step 4: Simplify right side
    415.09x = 78,788.87
  5. Step 5: Solve for x
    x = 78,788.87/415.09
  6. Step 6: Final answer
    x = 189.81

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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.