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Finding the Fourth Proportional to 28.44, 39.21 and 20.67

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Solution

The fourth proportional to 28.44, 39.21 and 20.67 is: 28.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.44 : 39.21 = 20.67 : x
  2. Step 2: Convert to fraction form
    28.44/39.21 = 20.67/x
  3. Step 3: Cross multiply
    28.44x = 39.21 × 20.67
  4. Step 4: Simplify right side
    28.44x = 810.47
  5. Step 5: Solve for x
    x = 810.47/28.44
  6. Step 6: Final answer
    x = 28.50

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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.