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Finding the Fourth Proportional to 22.20, 33.12 and 21.06

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Solution

The fourth proportional to 22.20, 33.12 and 21.06 is: 31.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.20 : 33.12 = 21.06 : x
  2. Step 2: Convert to fraction form
    22.20/33.12 = 21.06/x
  3. Step 3: Cross multiply
    22.20x = 33.12 × 21.06
  4. Step 4: Simplify right side
    22.20x = 697.51
  5. Step 5: Solve for x
    x = 697.51/22.20
  6. Step 6: Final answer
    x = 31.42

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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.