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Finding the Fourth Proportional to 119.19, 178.45 and 107.80

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Solution

The fourth proportional to 119.19, 178.45 and 107.80 is: 161.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.19 : 178.45 = 107.80 : x
  2. Step 2: Convert to fraction form
    119.19/178.45 = 107.80/x
  3. Step 3: Cross multiply
    119.19x = 178.45 × 107.80
  4. Step 4: Simplify right side
    119.19x = 19,236.37
  5. Step 5: Solve for x
    x = 19,236.37/119.19
  6. Step 6: Final answer
    x = 161.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.