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Finding the Fourth Proportional to 18,689.94, 28,016 and 12,120.30

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Solution

The fourth proportional to 18,689.94, 28,016 and 12,120.30 is: 18,168.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689.94 : 28,016 = 12,120.30 : x
  2. Step 2: Convert to fraction form
    18,689.94/28,016 = 12,120.30/x
  3. Step 3: Cross multiply
    18,689.94x = 28,016 × 12,120.30
  4. Step 4: Simplify right side
    18,689.94x = 339,562,324.80
  5. Step 5: Solve for x
    x = 339,562,324.80/18,689.94
  6. Step 6: Final answer
    x = 18,168.19

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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.