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Finding the Fourth Proportional to 28.17, 42.26 and 12.15

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Solution

The fourth proportional to 28.17, 42.26 and 12.15 is: 18.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.17 : 42.26 = 12.15 : x
  2. Step 2: Convert to fraction form
    28.17/42.26 = 12.15/x
  3. Step 3: Cross multiply
    28.17x = 42.26 × 12.15
  4. Step 4: Simplify right side
    28.17x = 513.40
  5. Step 5: Solve for x
    x = 513.40/28.17
  6. Step 6: Final answer
    x = 18.23

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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.