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Finding the Fourth Proportional to 126.64, 189.92 and 85.96

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Solution

The fourth proportional to 126.64, 189.92 and 85.96 is: 128.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.64 : 189.92 = 85.96 : x
  2. Step 2: Convert to fraction form
    126.64/189.92 = 85.96/x
  3. Step 3: Cross multiply
    126.64x = 189.92 × 85.96
  4. Step 4: Simplify right side
    126.64x = 16,325.52
  5. Step 5: Solve for x
    x = 16,325.52/126.64
  6. Step 6: Final answer
    x = 128.91

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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.