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Finding the Fourth Proportional to 119.92, 178.90 and 108.40

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Solution

The fourth proportional to 119.92, 178.90 and 108.40 is: 161.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.92 : 178.90 = 108.40 : x
  2. Step 2: Convert to fraction form
    119.92/178.90 = 108.40/x
  3. Step 3: Cross multiply
    119.92x = 178.90 × 108.40
  4. Step 4: Simplify right side
    119.92x = 19,392.76
  5. Step 5: Solve for x
    x = 19,392.76/119.92
  6. Step 6: Final answer
    x = 161.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.