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Finding the Fourth Proportional to 22.03, 30.61 and 21.79

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Solution

The fourth proportional to 22.03, 30.61 and 21.79 is: 30.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.03 : 30.61 = 21.79 : x
  2. Step 2: Convert to fraction form
    22.03/30.61 = 21.79/x
  3. Step 3: Cross multiply
    22.03x = 30.61 × 21.79
  4. Step 4: Simplify right side
    22.03x = 666.85
  5. Step 5: Solve for x
    x = 666.85/22.03
  6. Step 6: Final answer
    x = 30.28

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.