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Finding the Fourth Proportional to 126.79, 174.87 and 104.92

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Solution

The fourth proportional to 126.79, 174.87 and 104.92 is: 144.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.79 : 174.87 = 104.92 : x
  2. Step 2: Convert to fraction form
    126.79/174.87 = 104.92/x
  3. Step 3: Cross multiply
    126.79x = 174.87 × 104.92
  4. Step 4: Simplify right side
    126.79x = 18,347.36
  5. Step 5: Solve for x
    x = 18,347.36/126.79
  6. Step 6: Final answer
    x = 144.71

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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.