Home / 20,865.20-28,792.46-11,912.47

Finding the Fourth Proportional to 20,865.20, 28,792.46 and 11,912.47

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Solution

The fourth proportional to 20,865.20, 28,792.46 and 11,912.47 is: 16,438.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,865.20 : 28,792.46 = 11,912.47 : x
  2. Step 2: Convert to fraction form
    20,865.20/28,792.46 = 11,912.47/x
  3. Step 3: Cross multiply
    20,865.20x = 28,792.46 × 11,912.47
  4. Step 4: Simplify right side
    20,865.20x = 342,989,273.78
  5. Step 5: Solve for x
    x = 342,989,273.78/20,865.20
  6. Step 6: Final answer
    x = 16,438.34

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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.