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Finding the Fourth Proportional to 126.67, 189.70 and 80.88

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Solution

The fourth proportional to 126.67, 189.70 and 80.88 is: 121.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.67 : 189.70 = 80.88 : x
  2. Step 2: Convert to fraction form
    126.67/189.70 = 80.88/x
  3. Step 3: Cross multiply
    126.67x = 189.70 × 80.88
  4. Step 4: Simplify right side
    126.67x = 15,342.48
  5. Step 5: Solve for x
    x = 15,342.48/126.67
  6. Step 6: Final answer
    x = 121.12

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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.