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Finding the Fourth Proportional to 189.70, 261.80 and 106.81

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Solution

The fourth proportional to 189.70, 261.80 and 106.81 is: 147.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.70 : 261.80 = 106.81 : x
  2. Step 2: Convert to fraction form
    189.70/261.80 = 106.81/x
  3. Step 3: Cross multiply
    189.70x = 261.80 × 106.81
  4. Step 4: Simplify right side
    189.70x = 27,961.94
  5. Step 5: Solve for x
    x = 27,961.94/189.70
  6. Step 6: Final answer
    x = 147.40

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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.