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Finding the Fourth Proportional to 267.11, 400.40 and 128.24

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Solution

The fourth proportional to 267.11, 400.40 and 128.24 is: 192.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.11 : 400.40 = 128.24 : x
  2. Step 2: Convert to fraction form
    267.11/400.40 = 128.24/x
  3. Step 3: Cross multiply
    267.11x = 400.40 × 128.24
  4. Step 4: Simplify right side
    267.11x = 51,346.65
  5. Step 5: Solve for x
    x = 51,346.65/267.11
  6. Step 6: Final answer
    x = 192.23

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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.