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Finding the Fourth Proportional to 28.26, 42.42 and 18

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Solution

The fourth proportional to 28.26, 42.42 and 18 is: 27.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.26 : 42.42 = 18 : x
  2. Step 2: Convert to fraction form
    28.26/42.42 = 18/x
  3. Step 3: Cross multiply
    28.26x = 42.42 × 18
  4. Step 4: Simplify right side
    28.26x = 763.56
  5. Step 5: Solve for x
    x = 763.56/28.26
  6. Step 6: Final answer
    x = 27.02

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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.