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Finding the Fourth Proportional to 267.20, 400.86 and 82.11

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Solution

The fourth proportional to 267.20, 400.86 and 82.11 is: 123.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.20 : 400.86 = 82.11 : x
  2. Step 2: Convert to fraction form
    267.20/400.86 = 82.11/x
  3. Step 3: Cross multiply
    267.20x = 400.86 × 82.11
  4. Step 4: Simplify right side
    267.20x = 32,914.20
  5. Step 5: Solve for x
    x = 32,914.20/267.20
  6. Step 6: Final answer
    x = 123.18

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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.