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Finding the Fourth Proportional to 128.80, 193.32 and 119.86

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Solution

The fourth proportional to 128.80, 193.32 and 119.86 is: 179.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.80 : 193.32 = 119.86 : x
  2. Step 2: Convert to fraction form
    128.80/193.32 = 119.86/x
  3. Step 3: Cross multiply
    128.80x = 193.32 × 119.86
  4. Step 4: Simplify right side
    128.80x = 23,171.34
  5. Step 5: Solve for x
    x = 23,171.34/128.80
  6. Step 6: Final answer
    x = 179.90

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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.