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Finding the Fourth Proportional to 126.87, 189.26 and 113.22

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Solution

The fourth proportional to 126.87, 189.26 and 113.22 is: 168.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.87 : 189.26 = 113.22 : x
  2. Step 2: Convert to fraction form
    126.87/189.26 = 113.22/x
  3. Step 3: Cross multiply
    126.87x = 189.26 × 113.22
  4. Step 4: Simplify right side
    126.87x = 21,427.45
  5. Step 5: Solve for x
    x = 21,427.45/126.87
  6. Step 6: Final answer
    x = 168.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.