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Finding the Fourth Proportional to 18.94, 28.36 and 13.90

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Solution

The fourth proportional to 18.94, 28.36 and 13.90 is: 20.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.94 : 28.36 = 13.90 : x
  2. Step 2: Convert to fraction form
    18.94/28.36 = 13.90/x
  3. Step 3: Cross multiply
    18.94x = 28.36 × 13.90
  4. Step 4: Simplify right side
    18.94x = 394.24
  5. Step 5: Solve for x
    x = 394.24/18.94
  6. Step 6: Final answer
    x = 20.82

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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.