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Finding the Fourth Proportional to 126.94, 190.63 and 120.45

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Solution

The fourth proportional to 126.94, 190.63 and 120.45 is: 180.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.94 : 190.63 = 120.45 : x
  2. Step 2: Convert to fraction form
    126.94/190.63 = 120.45/x
  3. Step 3: Cross multiply
    126.94x = 190.63 × 120.45
  4. Step 4: Simplify right side
    126.94x = 22,961.38
  5. Step 5: Solve for x
    x = 22,961.38/126.94
  6. Step 6: Final answer
    x = 180.88

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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.