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Finding the Fourth Proportional to 22.29, 30.81 and 21.75

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Solution

The fourth proportional to 22.29, 30.81 and 21.75 is: 30.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.29 : 30.81 = 21.75 : x
  2. Step 2: Convert to fraction form
    22.29/30.81 = 21.75/x
  3. Step 3: Cross multiply
    22.29x = 30.81 × 21.75
  4. Step 4: Simplify right side
    22.29x = 670.12
  5. Step 5: Solve for x
    x = 670.12/22.29
  6. Step 6: Final answer
    x = 30.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.