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Finding the Fourth Proportional to 22.15, 30.54 and 21.79

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Solution

The fourth proportional to 22.15, 30.54 and 21.79 is: 30.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.15 : 30.54 = 21.79 : x
  2. Step 2: Convert to fraction form
    22.15/30.54 = 21.79/x
  3. Step 3: Cross multiply
    22.15x = 30.54 × 21.79
  4. Step 4: Simplify right side
    22.15x = 665.47
  5. Step 5: Solve for x
    x = 665.47/22.15
  6. Step 6: Final answer
    x = 30.04

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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.