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Finding the Fourth Proportional to 189.75, 261.90 and 112.17

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Solution

The fourth proportional to 189.75, 261.90 and 112.17 is: 154.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.75 : 261.90 = 112.17 : x
  2. Step 2: Convert to fraction form
    189.75/261.90 = 112.17/x
  3. Step 3: Cross multiply
    189.75x = 261.90 × 112.17
  4. Step 4: Simplify right side
    189.75x = 29,377.32
  5. Step 5: Solve for x
    x = 29,377.32/189.75
  6. Step 6: Final answer
    x = 154.82

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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.