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Finding the Fourth Proportional to 15,861.20, 21,889.80 and 8,789.84

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Solution

The fourth proportional to 15,861.20, 21,889.80 and 8,789.84 is: 12,130.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,861.20 : 21,889.80 = 8,789.84 : x
  2. Step 2: Convert to fraction form
    15,861.20/21,889.80 = 8,789.84/x
  3. Step 3: Cross multiply
    15,861.20x = 21,889.80 × 8,789.84
  4. Step 4: Simplify right side
    15,861.20x = 192,407,839.63
  5. Step 5: Solve for x
    x = 192,407,839.63/15,861.20
  6. Step 6: Final answer
    x = 12,130.72

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.