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Finding the Fourth Proportional to 22.05, 32.81 and 21.65

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Solution

The fourth proportional to 22.05, 32.81 and 21.65 is: 32.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.05 : 32.81 = 21.65 : x
  2. Step 2: Convert to fraction form
    22.05/32.81 = 21.65/x
  3. Step 3: Cross multiply
    22.05x = 32.81 × 21.65
  4. Step 4: Simplify right side
    22.05x = 710.06
  5. Step 5: Solve for x
    x = 710.06/22.05
  6. Step 6: Final answer
    x = 32.20

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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.