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Finding the Fourth Proportional to 201.82, 303.06 and 128.86

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Solution

The fourth proportional to 201.82, 303.06 and 128.86 is: 193.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.82 : 303.06 = 128.86 : x
  2. Step 2: Convert to fraction form
    201.82/303.06 = 128.86/x
  3. Step 3: Cross multiply
    201.82x = 303.06 × 128.86
  4. Step 4: Simplify right side
    201.82x = 39,052.31
  5. Step 5: Solve for x
    x = 39,052.31/201.82
  6. Step 6: Final answer
    x = 193.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.