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Finding the Fourth Proportional to 189.19, 261.17 and 121.97

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Solution

The fourth proportional to 189.19, 261.17 and 121.97 is: 168.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.19 : 261.17 = 121.97 : x
  2. Step 2: Convert to fraction form
    189.19/261.17 = 121.97/x
  3. Step 3: Cross multiply
    189.19x = 261.17 × 121.97
  4. Step 4: Simplify right side
    189.19x = 31,854.90
  5. Step 5: Solve for x
    x = 31,854.90/189.19
  6. Step 6: Final answer
    x = 168.38

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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.