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Finding the Fourth Proportional to 28,576.99, 42,869.13 and 8,856.73

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Solution

The fourth proportional to 28,576.99, 42,869.13 and 8,856.73 is: 13,286.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,576.99 : 42,869.13 = 8,856.73 : x
  2. Step 2: Convert to fraction form
    28,576.99/42,869.13 = 8,856.73/x
  3. Step 3: Cross multiply
    28,576.99x = 42,869.13 × 8,856.73
  4. Step 4: Simplify right side
    28,576.99x = 379,680,309.74
  5. Step 5: Solve for x
    x = 379,680,309.74/28,576.99
  6. Step 6: Final answer
    x = 13,286.22

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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.