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Finding the Fourth Proportional to 28,480.33, 42,721.19 and 8,759.03

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Solution

The fourth proportional to 28,480.33, 42,721.19 and 8,759.03 is: 13,138.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,480.33 : 42,721.19 = 8,759.03 : x
  2. Step 2: Convert to fraction form
    28,480.33/42,721.19 = 8,759.03/x
  3. Step 3: Cross multiply
    28,480.33x = 42,721.19 × 8,759.03
  4. Step 4: Simplify right side
    28,480.33x = 374,196,141.05
  5. Step 5: Solve for x
    x = 374,196,141.05/28,480.33
  6. Step 6: Final answer
    x = 13,138.76

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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.