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Finding the Fourth Proportional to 22.20, 33.28 and 21

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Solution

The fourth proportional to 22.20, 33.28 and 21 is: 31.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.20 : 33.28 = 21 : x
  2. Step 2: Convert to fraction form
    22.20/33.28 = 21/x
  3. Step 3: Cross multiply
    22.20x = 33.28 × 21
  4. Step 4: Simplify right side
    22.20x = 698.88
  5. Step 5: Solve for x
    x = 698.88/22.20
  6. Step 6: Final answer
    x = 31.48

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1.5x scale

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.