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Finding the Fourth Proportional to 190.38, 262.86 and 128.28

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Solution

The fourth proportional to 190.38, 262.86 and 128.28 is: 177.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.38 : 262.86 = 128.28 : x
  2. Step 2: Convert to fraction form
    190.38/262.86 = 128.28/x
  3. Step 3: Cross multiply
    190.38x = 262.86 × 128.28
  4. Step 4: Simplify right side
    190.38x = 33,719.68
  5. Step 5: Solve for x
    x = 33,719.68/190.38
  6. Step 6: Final answer
    x = 177.12

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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.