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Finding the Fourth Proportional to 269.91, 405.20 and 212.33

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Solution

The fourth proportional to 269.91, 405.20 and 212.33 is: 318.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.91 : 405.20 = 212.33 : x
  2. Step 2: Convert to fraction form
    269.91/405.20 = 212.33/x
  3. Step 3: Cross multiply
    269.91x = 405.20 × 212.33
  4. Step 4: Simplify right side
    269.91x = 86,037.66
  5. Step 5: Solve for x
    x = 86,037.66/269.91
  6. Step 6: Final answer
    x = 318.76

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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.