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Finding the Fourth Proportional to 22.45, 33.55 and 20.56

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Solution

The fourth proportional to 22.45, 33.55 and 20.56 is: 30.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.45 : 33.55 = 20.56 : x
  2. Step 2: Convert to fraction form
    22.45/33.55 = 20.56/x
  3. Step 3: Cross multiply
    22.45x = 33.55 × 20.56
  4. Step 4: Simplify right side
    22.45x = 689.52
  5. Step 5: Solve for x
    x = 689.52/22.45
  6. Step 6: Final answer
    x = 30.72

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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.