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Finding the Fourth Proportional to 28,520.82, 42,787.33 and 8,531.88

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Solution

The fourth proportional to 28,520.82, 42,787.33 and 8,531.88 is: 12,799.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,520.82 : 42,787.33 = 8,531.88 : x
  2. Step 2: Convert to fraction form
    28,520.82/42,787.33 = 8,531.88/x
  3. Step 3: Cross multiply
    28,520.82x = 42,787.33 × 8,531.88
  4. Step 4: Simplify right side
    28,520.82x = 365,056,365.08
  5. Step 5: Solve for x
    x = 365,056,365.08/28,520.82
  6. Step 6: Final answer
    x = 12,799.64

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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.