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Finding the Fourth Proportional to 28.45, 39.43 and 25.75

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Solution

The fourth proportional to 28.45, 39.43 and 25.75 is: 35.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.45 : 39.43 = 25.75 : x
  2. Step 2: Convert to fraction form
    28.45/39.43 = 25.75/x
  3. Step 3: Cross multiply
    28.45x = 39.43 × 25.75
  4. Step 4: Simplify right side
    28.45x = 1,015.32
  5. Step 5: Solve for x
    x = 1,015.32/28.45
  6. Step 6: Final answer
    x = 35.69

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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.