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Finding the Fourth Proportional to 28,512.64, 42,765.60 and 8,789.44

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Solution

The fourth proportional to 28,512.64, 42,765.60 and 8,789.44 is: 13,183.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,512.64 : 42,765.60 = 8,789.44 : x
  2. Step 2: Convert to fraction form
    28,512.64/42,765.60 = 8,789.44/x
  3. Step 3: Cross multiply
    28,512.64x = 42,765.60 × 8,789.44
  4. Step 4: Simplify right side
    28,512.64x = 375,885,675.26
  5. Step 5: Solve for x
    x = 375,885,675.26/28,512.64
  6. Step 6: Final answer
    x = 13,183.12

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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.