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Finding the Fourth Proportional to 190.89, 263.37 and 128.79

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Solution

The fourth proportional to 190.89, 263.37 and 128.79 is: 177.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.89 : 263.37 = 128.79 : x
  2. Step 2: Convert to fraction form
    190.89/263.37 = 128.79/x
  3. Step 3: Cross multiply
    190.89x = 263.37 × 128.79
  4. Step 4: Simplify right side
    190.89x = 33,919.42
  5. Step 5: Solve for x
    x = 33,919.42/190.89
  6. Step 6: Final answer
    x = 177.69

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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.