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Finding the Fourth Proportional to 25.34, 34.94 and 21.88

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Solution

The fourth proportional to 25.34, 34.94 and 21.88 is: 30.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.34 : 34.94 = 21.88 : x
  2. Step 2: Convert to fraction form
    25.34/34.94 = 21.88/x
  3. Step 3: Cross multiply
    25.34x = 34.94 × 21.88
  4. Step 4: Simplify right side
    25.34x = 764.49
  5. Step 5: Solve for x
    x = 764.49/25.34
  6. Step 6: Final answer
    x = 30.18

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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.