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Finding the Fourth Proportional to 28.10, 38.73 and 21.95

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Solution

The fourth proportional to 28.10, 38.73 and 21.95 is: 30.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.10 : 38.73 = 21.95 : x
  2. Step 2: Convert to fraction form
    28.10/38.73 = 21.95/x
  3. Step 3: Cross multiply
    28.10x = 38.73 × 21.95
  4. Step 4: Simplify right side
    28.10x = 849.93
  5. Step 5: Solve for x
    x = 849.93/28.10
  6. Step 6: Final answer
    x = 30.25

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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.