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Finding the Fourth Proportional to 28.69, 39.61 and 22.54

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Solution

The fourth proportional to 28.69, 39.61 and 22.54 is: 31.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.69 : 39.61 = 22.54 : x
  2. Step 2: Convert to fraction form
    28.69/39.61 = 22.54/x
  3. Step 3: Cross multiply
    28.69x = 39.61 × 22.54
  4. Step 4: Simplify right side
    28.69x = 892.65
  5. Step 5: Solve for x
    x = 892.65/28.69
  6. Step 6: Final answer
    x = 31.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.