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Finding the Fourth Proportional to 201.21, 301.50 and 128.94

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Solution

The fourth proportional to 201.21, 301.50 and 128.94 is: 193.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.21 : 301.50 = 128.94 : x
  2. Step 2: Convert to fraction form
    201.21/301.50 = 128.94/x
  3. Step 3: Cross multiply
    201.21x = 301.50 × 128.94
  4. Step 4: Simplify right side
    201.21x = 38,875.41
  5. Step 5: Solve for x
    x = 38,875.41/201.21
  6. Step 6: Final answer
    x = 193.21

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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.