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Finding the Fourth Proportional to 22.16, 33.08 and 20.90

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Solution

The fourth proportional to 22.16, 33.08 and 20.90 is: 31.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.16 : 33.08 = 20.90 : x
  2. Step 2: Convert to fraction form
    22.16/33.08 = 20.90/x
  3. Step 3: Cross multiply
    22.16x = 33.08 × 20.90
  4. Step 4: Simplify right side
    22.16x = 691.10
  5. Step 5: Solve for x
    x = 691.10/22.16
  6. Step 6: Final answer
    x = 31.19

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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.