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Finding the Fourth Proportional to 28.04, 38.66 and 20.75

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Solution

The fourth proportional to 28.04, 38.66 and 20.75 is: 28.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.04 : 38.66 = 20.75 : x
  2. Step 2: Convert to fraction form
    28.04/38.66 = 20.75/x
  3. Step 3: Cross multiply
    28.04x = 38.66 × 20.75
  4. Step 4: Simplify right side
    28.04x = 801.90
  5. Step 5: Solve for x
    x = 801.90/28.04
  6. Step 6: Final answer
    x = 28.60

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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.