Home / 20,618.43-28,451.70-12,120.83

Finding the Fourth Proportional to 20,618.43, 28,451.70 and 12,120.83

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Solution

The fourth proportional to 20,618.43, 28,451.70 and 12,120.83 is: 16,725.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,618.43 : 28,451.70 = 12,120.83 : x
  2. Step 2: Convert to fraction form
    20,618.43/28,451.70 = 12,120.83/x
  3. Step 3: Cross multiply
    20,618.43x = 28,451.70 × 12,120.83
  4. Step 4: Simplify right side
    20,618.43x = 344,858,076.65
  5. Step 5: Solve for x
    x = 344,858,076.65/20,618.43
  6. Step 6: Final answer
    x = 16,725.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.