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Finding the Fourth Proportional to 18.24, 27.34 and 12.88

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Solution

The fourth proportional to 18.24, 27.34 and 12.88 is: 19.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.24 : 27.34 = 12.88 : x
  2. Step 2: Convert to fraction form
    18.24/27.34 = 12.88/x
  3. Step 3: Cross multiply
    18.24x = 27.34 × 12.88
  4. Step 4: Simplify right side
    18.24x = 352.14
  5. Step 5: Solve for x
    x = 352.14/18.24
  6. Step 6: Final answer
    x = 19.31

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.