Home / 20,975.75-28,943.19-12,021.60

Finding the Fourth Proportional to 20,975.75, 28,943.19 and 12,021.60

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Solution

The fourth proportional to 20,975.75, 28,943.19 and 12,021.60 is: 16,587.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,975.75 : 28,943.19 = 12,021.60 : x
  2. Step 2: Convert to fraction form
    20,975.75/28,943.19 = 12,021.60/x
  3. Step 3: Cross multiply
    20,975.75x = 28,943.19 × 12,021.60
  4. Step 4: Simplify right side
    20,975.75x = 347,943,452.90
  5. Step 5: Solve for x
    x = 347,943,452.90/20,975.75
  6. Step 6: Final answer
    x = 16,587.89

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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.