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Finding the Fourth Proportional to 18.26, 27.35 and 9.21

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Solution

The fourth proportional to 18.26, 27.35 and 9.21 is: 13.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.26 : 27.35 = 9.21 : x
  2. Step 2: Convert to fraction form
    18.26/27.35 = 9.21/x
  3. Step 3: Cross multiply
    18.26x = 27.35 × 9.21
  4. Step 4: Simplify right side
    18.26x = 251.89
  5. Step 5: Solve for x
    x = 251.89/18.26
  6. Step 6: Final answer
    x = 13.79

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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.