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Finding the Fourth Proportional to 28.02, 42.33 and 27.21

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Solution

The fourth proportional to 28.02, 42.33 and 27.21 is: 41.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.02 : 42.33 = 27.21 : x
  2. Step 2: Convert to fraction form
    28.02/42.33 = 27.21/x
  3. Step 3: Cross multiply
    28.02x = 42.33 × 27.21
  4. Step 4: Simplify right side
    28.02x = 1,151.80
  5. Step 5: Solve for x
    x = 1,151.80/28.02
  6. Step 6: Final answer
    x = 41.11

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.