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Finding the Fourth Proportional to 18,121.88, 27,201.24 and 12,499.94

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Solution

The fourth proportional to 18,121.88, 27,201.24 and 12,499.94 is: 18,762.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,121.88 : 27,201.24 = 12,499.94 : x
  2. Step 2: Convert to fraction form
    18,121.88/27,201.24 = 12,499.94/x
  3. Step 3: Cross multiply
    18,121.88x = 27,201.24 × 12,499.94
  4. Step 4: Simplify right side
    18,121.88x = 340,013,731.92
  5. Step 5: Solve for x
    x = 340,013,731.92/18,121.88
  6. Step 6: Final answer
    x = 18,762.61

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1.5x scale

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.