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Finding the Fourth Proportional to 25.63, 38.26 and 20.56

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Solution

The fourth proportional to 25.63, 38.26 and 20.56 is: 30.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.63 : 38.26 = 20.56 : x
  2. Step 2: Convert to fraction form
    25.63/38.26 = 20.56/x
  3. Step 3: Cross multiply
    25.63x = 38.26 × 20.56
  4. Step 4: Simplify right side
    25.63x = 786.63
  5. Step 5: Solve for x
    x = 786.63/25.63
  6. Step 6: Final answer
    x = 30.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.