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Finding the Fourth Proportional to 126.26, 189.38 and 76.88

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Solution

The fourth proportional to 126.26, 189.38 and 76.88 is: 115.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.26 : 189.38 = 76.88 : x
  2. Step 2: Convert to fraction form
    126.26/189.38 = 76.88/x
  3. Step 3: Cross multiply
    126.26x = 189.38 × 76.88
  4. Step 4: Simplify right side
    126.26x = 14,558.20
  5. Step 5: Solve for x
    x = 14,558.20/126.26
  6. Step 6: Final answer
    x = 115.31

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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.