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Finding the Fourth Proportional to 133.39, 201.25 and 128.84

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Solution

The fourth proportional to 133.39, 201.25 and 128.84 is: 194.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.39 : 201.25 = 128.84 : x
  2. Step 2: Convert to fraction form
    133.39/201.25 = 128.84/x
  3. Step 3: Cross multiply
    133.39x = 201.25 × 128.84
  4. Step 4: Simplify right side
    133.39x = 25,929.05
  5. Step 5: Solve for x
    x = 25,929.05/133.39
  6. Step 6: Final answer
    x = 194.39

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.