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Finding the Fourth Proportional to 126.11, 188.72 and 77.33

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Solution

The fourth proportional to 126.11, 188.72 and 77.33 is: 115.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.11 : 188.72 = 77.33 : x
  2. Step 2: Convert to fraction form
    126.11/188.72 = 77.33/x
  3. Step 3: Cross multiply
    126.11x = 188.72 × 77.33
  4. Step 4: Simplify right side
    126.11x = 14,594.09
  5. Step 5: Solve for x
    x = 14,594.09/126.11
  6. Step 6: Final answer
    x = 115.73

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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.