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Finding the Fourth Proportional to 22.00, 33.02 and 20.78

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Solution

The fourth proportional to 22.00, 33.02 and 20.78 is: 31.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.00 : 33.02 = 20.78 : x
  2. Step 2: Convert to fraction form
    22.00/33.02 = 20.78/x
  3. Step 3: Cross multiply
    22.00x = 33.02 × 20.78
  4. Step 4: Simplify right side
    22.00x = 686.05
  5. Step 5: Solve for x
    x = 686.05/22.00
  6. Step 6: Final answer
    x = 31.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.