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Finding the Fourth Proportional to 18.26, 27.31 and 13.68

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Solution

The fourth proportional to 18.26, 27.31 and 13.68 is: 20.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.26 : 27.31 = 13.68 : x
  2. Step 2: Convert to fraction form
    18.26/27.31 = 13.68/x
  3. Step 3: Cross multiply
    18.26x = 27.31 × 13.68
  4. Step 4: Simplify right side
    18.26x = 373.72
  5. Step 5: Solve for x
    x = 373.72/18.26
  6. Step 6: Final answer
    x = 20.47

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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.