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Finding the Fourth Proportional to 190.92, 263.55 and 128.97

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Solution

The fourth proportional to 190.92, 263.55 and 128.97 is: 178.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.92 : 263.55 = 128.97 : x
  2. Step 2: Convert to fraction form
    190.92/263.55 = 128.97/x
  3. Step 3: Cross multiply
    190.92x = 263.55 × 128.97
  4. Step 4: Simplify right side
    190.92x = 33,990.04
  5. Step 5: Solve for x
    x = 33,990.04/190.92
  6. Step 6: Final answer
    x = 178.03

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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.