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Finding the Fourth Proportional to 189.45, 261.39 and 119.49

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Solution

The fourth proportional to 189.45, 261.39 and 119.49 is: 164.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.45 : 261.39 = 119.49 : x
  2. Step 2: Convert to fraction form
    189.45/261.39 = 119.49/x
  3. Step 3: Cross multiply
    189.45x = 261.39 × 119.49
  4. Step 4: Simplify right side
    189.45x = 31,233.49
  5. Step 5: Solve for x
    x = 31,233.49/189.45
  6. Step 6: Final answer
    x = 164.86

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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.