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Finding the Fourth Proportional to 22, 30.42 and 20.86

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Solution

The fourth proportional to 22, 30.42 and 20.86 is: 28.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    22 : 30.42 = 20.86 : x
  2. Step 2: Convert to fraction form
    22/30.42 = 20.86/x
  3. Step 3: Cross multiply
    22x = 30.42 × 20.86
  4. Step 4: Simplify right side
    22x = 634.56
  5. Step 5: Solve for x
    x = 634.56/22
  6. Step 6: Final answer
    x = 28.84

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1.5x scale

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.