Home / 20,865.05-28,793.30-11,912.34

Finding the Fourth Proportional to 20,865.05, 28,793.30 and 11,912.34

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Solution

The fourth proportional to 20,865.05, 28,793.30 and 11,912.34 is: 16,438.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,865.05 : 28,793.30 = 11,912.34 : x
  2. Step 2: Convert to fraction form
    20,865.05/28,793.30 = 11,912.34/x
  3. Step 3: Cross multiply
    20,865.05x = 28,793.30 × 11,912.34
  4. Step 4: Simplify right side
    20,865.05x = 342,995,519.76
  5. Step 5: Solve for x
    x = 342,995,519.76/20,865.05
  6. Step 6: Final answer
    x = 16,438.76

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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.