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Finding the Fourth Proportional to 25.21, 34.81 and 22.17

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Solution

The fourth proportional to 25.21, 34.81 and 22.17 is: 30.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.21 : 34.81 = 22.17 : x
  2. Step 2: Convert to fraction form
    25.21/34.81 = 22.17/x
  3. Step 3: Cross multiply
    25.21x = 34.81 × 22.17
  4. Step 4: Simplify right side
    25.21x = 771.74
  5. Step 5: Solve for x
    x = 771.74/25.21
  6. Step 6: Final answer
    x = 30.62

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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.