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Finding the Fourth Proportional to 18,916.68, 28,390.14 and 8,529.24

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Solution

The fourth proportional to 18,916.68, 28,390.14 and 8,529.24 is: 12,800.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,916.68 : 28,390.14 = 8,529.24 : x
  2. Step 2: Convert to fraction form
    18,916.68/28,390.14 = 8,529.24/x
  3. Step 3: Cross multiply
    18,916.68x = 28,390.14 × 8,529.24
  4. Step 4: Simplify right side
    18,916.68x = 242,146,317.69
  5. Step 5: Solve for x
    x = 242,146,317.69/18,916.68
  6. Step 6: Final answer
    x = 12,800.68

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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.