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Finding the Fourth Proportional to 126.38, 174.32 and 103.09

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Solution

The fourth proportional to 126.38, 174.32 and 103.09 is: 142.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.38 : 174.32 = 103.09 : x
  2. Step 2: Convert to fraction form
    126.38/174.32 = 103.09/x
  3. Step 3: Cross multiply
    126.38x = 174.32 × 103.09
  4. Step 4: Simplify right side
    126.38x = 17,969.78
  5. Step 5: Solve for x
    x = 17,969.78/126.38
  6. Step 6: Final answer
    x = 142.19

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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.