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Finding the Fourth Proportional to 201.01, 301.65 and 128.92

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Solution

The fourth proportional to 201.01, 301.65 and 128.92 is: 193.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.01 : 301.65 = 128.92 : x
  2. Step 2: Convert to fraction form
    201.01/301.65 = 128.92/x
  3. Step 3: Cross multiply
    201.01x = 301.65 × 128.92
  4. Step 4: Simplify right side
    201.01x = 38,888.72
  5. Step 5: Solve for x
    x = 38,888.72/201.01
  6. Step 6: Final answer
    x = 193.47

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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.