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Finding the Fourth Proportional to 20.26, 27.93 and 18.64

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Solution

The fourth proportional to 20.26, 27.93 and 18.64 is: 25.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.26 : 27.93 = 18.64 : x
  2. Step 2: Convert to fraction form
    20.26/27.93 = 18.64/x
  3. Step 3: Cross multiply
    20.26x = 27.93 × 18.64
  4. Step 4: Simplify right side
    20.26x = 520.62
  5. Step 5: Solve for x
    x = 520.62/20.26
  6. Step 6: Final answer
    x = 25.70

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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.