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Finding the Fourth Proportional to 20.66, 28.46 and 13.37

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Solution

The fourth proportional to 20.66, 28.46 and 13.37 is: 18.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.66 : 28.46 = 13.37 : x
  2. Step 2: Convert to fraction form
    20.66/28.46 = 13.37/x
  3. Step 3: Cross multiply
    20.66x = 28.46 × 13.37
  4. Step 4: Simplify right side
    20.66x = 380.40
  5. Step 5: Solve for x
    x = 380.40/20.66
  6. Step 6: Final answer
    x = 18.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.