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Finding the Fourth Proportional to 22.21, 30.62 and 20.35

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Solution

The fourth proportional to 22.21, 30.62 and 20.35 is: 28.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.21 : 30.62 = 20.35 : x
  2. Step 2: Convert to fraction form
    22.21/30.62 = 20.35/x
  3. Step 3: Cross multiply
    22.21x = 30.62 × 20.35
  4. Step 4: Simplify right side
    22.21x = 623.02
  5. Step 5: Solve for x
    x = 623.02/22.21
  6. Step 6: Final answer
    x = 28.05

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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.