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Finding the Fourth Proportional to 126.04, 189.35 and 80.42

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Solution

The fourth proportional to 126.04, 189.35 and 80.42 is: 120.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.04 : 189.35 = 80.42 : x
  2. Step 2: Convert to fraction form
    126.04/189.35 = 80.42/x
  3. Step 3: Cross multiply
    126.04x = 189.35 × 80.42
  4. Step 4: Simplify right side
    126.04x = 15,227.53
  5. Step 5: Solve for x
    x = 15,227.53/126.04
  6. Step 6: Final answer
    x = 120.82

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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.