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Finding the Fourth Proportional to 15,211.80, 22,785.30 and 12,619.80

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Solution

The fourth proportional to 15,211.80, 22,785.30 and 12,619.80 is: 18,902.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,211.80 : 22,785.30 = 12,619.80 : x
  2. Step 2: Convert to fraction form
    15,211.80/22,785.30 = 12,619.80/x
  3. Step 3: Cross multiply
    15,211.80x = 22,785.30 × 12,619.80
  4. Step 4: Simplify right side
    15,211.80x = 287,545,928.94
  5. Step 5: Solve for x
    x = 287,545,928.94/15,211.80
  6. Step 6: Final answer
    x = 18,902.82

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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.