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Finding the Fourth Proportional to 22.25, 30.69 and 20.31

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Solution

The fourth proportional to 22.25, 30.69 and 20.31 is: 28.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.25 : 30.69 = 20.31 : x
  2. Step 2: Convert to fraction form
    22.25/30.69 = 20.31/x
  3. Step 3: Cross multiply
    22.25x = 30.69 × 20.31
  4. Step 4: Simplify right side
    22.25x = 623.31
  5. Step 5: Solve for x
    x = 623.31/22.25
  6. Step 6: Final answer
    x = 28.02

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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.