Home / 20,128.60-30,192.90-18,816.40

Finding the Fourth Proportional to 20,128.60, 30,192.90 and 18,816.40

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Solution

The fourth proportional to 20,128.60, 30,192.90 and 18,816.40 is: 28,224.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.60 : 30,192.90 = 18,816.40 : x
  2. Step 2: Convert to fraction form
    20,128.60/30,192.90 = 18,816.40/x
  3. Step 3: Cross multiply
    20,128.60x = 30,192.90 × 18,816.40
  4. Step 4: Simplify right side
    20,128.60x = 568,121,683.56
  5. Step 5: Solve for x
    x = 568,121,683.56/20,128.60
  6. Step 6: Final answer
    x = 28,224.60

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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.