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Finding the Fourth Proportional to 201.37, 301.67 and 128.15

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Solution

The fourth proportional to 201.37, 301.67 and 128.15 is: 191.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.37 : 301.67 = 128.15 : x
  2. Step 2: Convert to fraction form
    201.37/301.67 = 128.15/x
  3. Step 3: Cross multiply
    201.37x = 301.67 × 128.15
  4. Step 4: Simplify right side
    201.37x = 38,658.37
  5. Step 5: Solve for x
    x = 38,658.37/201.37
  6. Step 6: Final answer
    x = 191.98

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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.