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Finding the Fourth Proportional to 28.26, 42.15 and 25.22

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Solution

The fourth proportional to 28.26, 42.15 and 25.22 is: 37.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.26 : 42.15 = 25.22 : x
  2. Step 2: Convert to fraction form
    28.26/42.15 = 25.22/x
  3. Step 3: Cross multiply
    28.26x = 42.15 × 25.22
  4. Step 4: Simplify right side
    28.26x = 1,063.02
  5. Step 5: Solve for x
    x = 1,063.02/28.26
  6. Step 6: Final answer
    x = 37.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.