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Finding the Fourth Proportional to 189.75, 261.89 and 112.13

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Solution

The fourth proportional to 189.75, 261.89 and 112.13 is: 154.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.75 : 261.89 = 112.13 : x
  2. Step 2: Convert to fraction form
    189.75/261.89 = 112.13/x
  3. Step 3: Cross multiply
    189.75x = 261.89 × 112.13
  4. Step 4: Simplify right side
    189.75x = 29,365.73
  5. Step 5: Solve for x
    x = 29,365.73/189.75
  6. Step 6: Final answer
    x = 154.76

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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.