Home / 13,682.40-20,535.60-8,128.80

Finding the Fourth Proportional to 13,682.40, 20,535.60 and 8,128.80

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Solution

The fourth proportional to 13,682.40, 20,535.60 and 8,128.80 is: 12,200.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,682.40 : 20,535.60 = 8,128.80 : x
  2. Step 2: Convert to fraction form
    13,682.40/20,535.60 = 8,128.80/x
  3. Step 3: Cross multiply
    13,682.40x = 20,535.60 × 8,128.80
  4. Step 4: Simplify right side
    13,682.40x = 166,929,785.28
  5. Step 5: Solve for x
    x = 166,929,785.28/13,682.40
  6. Step 6: Final answer
    x = 12,200.33

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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.