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Finding the Fourth Proportional to 189.69, 261.78 and 106.79

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Solution

The fourth proportional to 189.69, 261.78 and 106.79 is: 147.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.69 : 261.78 = 106.79 : x
  2. Step 2: Convert to fraction form
    189.69/261.78 = 106.79/x
  3. Step 3: Cross multiply
    189.69x = 261.78 × 106.79
  4. Step 4: Simplify right side
    189.69x = 27,955.49
  5. Step 5: Solve for x
    x = 27,955.49/189.69
  6. Step 6: Final answer
    x = 147.37

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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.