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Finding the Fourth Proportional to 267.75, 401.60 and 85.27

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Solution

The fourth proportional to 267.75, 401.60 and 85.27 is: 127.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.75 : 401.60 = 85.27 : x
  2. Step 2: Convert to fraction form
    267.75/401.60 = 85.27/x
  3. Step 3: Cross multiply
    267.75x = 401.60 × 85.27
  4. Step 4: Simplify right side
    267.75x = 34,244.43
  5. Step 5: Solve for x
    x = 34,244.43/267.75
  6. Step 6: Final answer
    x = 127.90

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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.