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Finding the Fourth Proportional to 126.84, 190.26 and 83.78

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Solution

The fourth proportional to 126.84, 190.26 and 83.78 is: 125.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.84 : 190.26 = 83.78 : x
  2. Step 2: Convert to fraction form
    126.84/190.26 = 83.78/x
  3. Step 3: Cross multiply
    126.84x = 190.26 × 83.78
  4. Step 4: Simplify right side
    126.84x = 15,939.98
  5. Step 5: Solve for x
    x = 15,939.98/126.84
  6. Step 6: Final answer
    x = 125.67

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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.