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Finding the Fourth Proportional to 189.46, 261.43 and 115.85

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Solution

The fourth proportional to 189.46, 261.43 and 115.85 is: 159.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.46 : 261.43 = 115.85 : x
  2. Step 2: Convert to fraction form
    189.46/261.43 = 115.85/x
  3. Step 3: Cross multiply
    189.46x = 261.43 × 115.85
  4. Step 4: Simplify right side
    189.46x = 30,286.70
  5. Step 5: Solve for x
    x = 30,286.70/189.46
  6. Step 6: Final answer
    x = 159.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.