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Finding the Fourth Proportional to 18.20, 27.18 and 16.40

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Solution

The fourth proportional to 18.20, 27.18 and 16.40 is: 24.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.20 : 27.18 = 16.40 : x
  2. Step 2: Convert to fraction form
    18.20/27.18 = 16.40/x
  3. Step 3: Cross multiply
    18.20x = 27.18 × 16.40
  4. Step 4: Simplify right side
    18.20x = 445.75
  5. Step 5: Solve for x
    x = 445.75/18.20
  6. Step 6: Final answer
    x = 24.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.