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Finding the Fourth Proportional to 415.39, 623.09 and 126.83

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Solution

The fourth proportional to 415.39, 623.09 and 126.83 is: 190.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.39 : 623.09 = 126.83 : x
  2. Step 2: Convert to fraction form
    415.39/623.09 = 126.83/x
  3. Step 3: Cross multiply
    415.39x = 623.09 × 126.83
  4. Step 4: Simplify right side
    415.39x = 79,025.87
  5. Step 5: Solve for x
    x = 79,025.87/415.39
  6. Step 6: Final answer
    x = 190.25

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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.