Home / 13,491.43-20,229.31-4,128.78

Finding the Fourth Proportional to 13,491.43, 20,229.31 and 4,128.78

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Solution

The fourth proportional to 13,491.43, 20,229.31 and 4,128.78 is: 6,190.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,491.43 : 20,229.31 = 4,128.78 : x
  2. Step 2: Convert to fraction form
    13,491.43/20,229.31 = 4,128.78/x
  3. Step 3: Cross multiply
    13,491.43x = 20,229.31 × 4,128.78
  4. Step 4: Simplify right side
    13,491.43x = 83,522,370.54
  5. Step 5: Solve for x
    x = 83,522,370.54/13,491.43
  6. Step 6: Final answer
    x = 6,190.77

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1.5x scale

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.