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Finding the Fourth Proportional to 201.10, 301.70 and 85.49

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Solution

The fourth proportional to 201.10, 301.70 and 85.49 is: 128.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.10 : 301.70 = 85.49 : x
  2. Step 2: Convert to fraction form
    201.10/301.70 = 85.49/x
  3. Step 3: Cross multiply
    201.10x = 301.70 × 85.49
  4. Step 4: Simplify right side
    201.10x = 25,792.33
  5. Step 5: Solve for x
    x = 25,792.33/201.10
  6. Step 6: Final answer
    x = 128.26

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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.