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Finding the Fourth Proportional to 146.38, 201.78 and 128.96

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Solution

The fourth proportional to 146.38, 201.78 and 128.96 is: 177.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.38 : 201.78 = 128.96 : x
  2. Step 2: Convert to fraction form
    146.38/201.78 = 128.96/x
  3. Step 3: Cross multiply
    146.38x = 201.78 × 128.96
  4. Step 4: Simplify right side
    146.38x = 26,021.55
  5. Step 5: Solve for x
    x = 26,021.55/146.38
  6. Step 6: Final answer
    x = 177.77

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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.