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Finding the Fourth Proportional to 22.12, 33 and 20.65

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Solution

The fourth proportional to 22.12, 33 and 20.65 is: 30.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.12 : 33 = 20.65 : x
  2. Step 2: Convert to fraction form
    22.12/33 = 20.65/x
  3. Step 3: Cross multiply
    22.12x = 33 × 20.65
  4. Step 4: Simplify right side
    22.12x = 681.37
  5. Step 5: Solve for x
    x = 681.37/22.12
  6. Step 6: Final answer
    x = 30.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.