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Finding the Fourth Proportional to 126.06, 189.12 and 105.90

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Solution

The fourth proportional to 126.06, 189.12 and 105.90 is: 158.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.06 : 189.12 = 105.90 : x
  2. Step 2: Convert to fraction form
    126.06/189.12 = 105.90/x
  3. Step 3: Cross multiply
    126.06x = 189.12 × 105.90
  4. Step 4: Simplify right side
    126.06x = 20,027.81
  5. Step 5: Solve for x
    x = 20,027.81/126.06
  6. Step 6: Final answer
    x = 158.88

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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.