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Finding the Fourth Proportional to 201.18, 301.78 and 85.64

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Solution

The fourth proportional to 201.18, 301.78 and 85.64 is: 128.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.18 : 301.78 = 85.64 : x
  2. Step 2: Convert to fraction form
    201.18/301.78 = 85.64/x
  3. Step 3: Cross multiply
    201.18x = 301.78 × 85.64
  4. Step 4: Simplify right side
    201.18x = 25,844.44
  5. Step 5: Solve for x
    x = 25,844.44/201.18
  6. Step 6: Final answer
    x = 128.46

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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.