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Finding the Fourth Proportional to 28.16, 42.22 and 20.20

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Solution

The fourth proportional to 28.16, 42.22 and 20.20 is: 30.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.16 : 42.22 = 20.20 : x
  2. Step 2: Convert to fraction form
    28.16/42.22 = 20.20/x
  3. Step 3: Cross multiply
    28.16x = 42.22 × 20.20
  4. Step 4: Simplify right side
    28.16x = 852.84
  5. Step 5: Solve for x
    x = 852.84/28.16
  6. Step 6: Final answer
    x = 30.29

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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.