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Finding the Fourth Proportional to 28.49, 39.59 and 28.11

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Solution

The fourth proportional to 28.49, 39.59 and 28.11 is: 39.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.49 : 39.59 = 28.11 : x
  2. Step 2: Convert to fraction form
    28.49/39.59 = 28.11/x
  3. Step 3: Cross multiply
    28.49x = 39.59 × 28.11
  4. Step 4: Simplify right side
    28.49x = 1,112.87
  5. Step 5: Solve for x
    x = 1,112.87/28.49
  6. Step 6: Final answer
    x = 39.06

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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.