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Finding the Fourth Proportional to 126.19, 189.30 and 42.81

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Solution

The fourth proportional to 126.19, 189.30 and 42.81 is: 64.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.19 : 189.30 = 42.81 : x
  2. Step 2: Convert to fraction form
    126.19/189.30 = 42.81/x
  3. Step 3: Cross multiply
    126.19x = 189.30 × 42.81
  4. Step 4: Simplify right side
    126.19x = 8,103.93
  5. Step 5: Solve for x
    x = 8,103.93/126.19
  6. Step 6: Final answer
    x = 64.22

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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.