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Finding the Fourth Proportional to 28,581.96, 42,879.42 and 8,861.16

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Solution

The fourth proportional to 28,581.96, 42,879.42 and 8,861.16 is: 13,293.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,581.96 : 42,879.42 = 8,861.16 : x
  2. Step 2: Convert to fraction form
    28,581.96/42,879.42 = 8,861.16/x
  3. Step 3: Cross multiply
    28,581.96x = 42,879.42 × 8,861.16
  4. Step 4: Simplify right side
    28,581.96x = 379,961,401.33
  5. Step 5: Solve for x
    x = 379,961,401.33/28,581.96
  6. Step 6: Final answer
    x = 13,293.75

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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.