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Finding the Fourth Proportional to 22.72, 33.80 and 21.32

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Solution

The fourth proportional to 22.72, 33.80 and 21.32 is: 31.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.72 : 33.80 = 21.32 : x
  2. Step 2: Convert to fraction form
    22.72/33.80 = 21.32/x
  3. Step 3: Cross multiply
    22.72x = 33.80 × 21.32
  4. Step 4: Simplify right side
    22.72x = 720.62
  5. Step 5: Solve for x
    x = 720.62/22.72
  6. Step 6: Final answer
    x = 31.72

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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.