Home / 20,739,236.42-28,612,163.88-12,990,789.38

Finding the Fourth Proportional to 20,739,236.42, 28,612,163.88 and 12,990,789.38

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Solution

The fourth proportional to 20,739,236.42, 28,612,163.88 and 12,990,789.38 is: 17,922,289.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739,236.42 : 28,612,163.88 = 12,990,789.38 : x
  2. Step 2: Convert to fraction form
    20,739,236.42/28,612,163.88 = 12,990,789.38/x
  3. Step 3: Cross multiply
    20,739,236.42x = 28,612,163.88 × 12,990,789.38
  4. Step 4: Simplify right side
    20,739,236.42x = 371,694,594,671,123.62
  5. Step 5: Solve for x
    x = 371,694,594,671,123.62/20,739,236.42
  6. Step 6: Final answer
    x = 17,922,289.29

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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.