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Finding the Fourth Proportional to 28.11, 42.19 and 15.94

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Solution

The fourth proportional to 28.11, 42.19 and 15.94 is: 23.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.11 : 42.19 = 15.94 : x
  2. Step 2: Convert to fraction form
    28.11/42.19 = 15.94/x
  3. Step 3: Cross multiply
    28.11x = 42.19 × 15.94
  4. Step 4: Simplify right side
    28.11x = 672.36
  5. Step 5: Solve for x
    x = 672.36/28.11
  6. Step 6: Final answer
    x = 23.92

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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.