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Finding the Fourth Proportional to 22.24, 33.30 and 20.70

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Solution

The fourth proportional to 22.24, 33.30 and 20.70 is: 30.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.24 : 33.30 = 20.70 : x
  2. Step 2: Convert to fraction form
    22.24/33.30 = 20.70/x
  3. Step 3: Cross multiply
    22.24x = 33.30 × 20.70
  4. Step 4: Simplify right side
    22.24x = 689.31
  5. Step 5: Solve for x
    x = 689.31/22.24
  6. Step 6: Final answer
    x = 30.99

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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.