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Finding the Fourth Proportional to 28.75, 43.15 and 20.60

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Solution

The fourth proportional to 28.75, 43.15 and 20.60 is: 30.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.75 : 43.15 = 20.60 : x
  2. Step 2: Convert to fraction form
    28.75/43.15 = 20.60/x
  3. Step 3: Cross multiply
    28.75x = 43.15 × 20.60
  4. Step 4: Simplify right side
    28.75x = 888.89
  5. Step 5: Solve for x
    x = 888.89/28.75
  6. Step 6: Final answer
    x = 30.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.