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Finding the Fourth Proportional to 126.39, 174.42 and 77.25

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Solution

The fourth proportional to 126.39, 174.42 and 77.25 is: 106.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.39 : 174.42 = 77.25 : x
  2. Step 2: Convert to fraction form
    126.39/174.42 = 77.25/x
  3. Step 3: Cross multiply
    126.39x = 174.42 × 77.25
  4. Step 4: Simplify right side
    126.39x = 13,473.95
  5. Step 5: Solve for x
    x = 13,473.95/126.39
  6. Step 6: Final answer
    x = 106.61

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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.