Home / 20,986.72-28,975.60-13,040.80

Finding the Fourth Proportional to 20,986.72, 28,975.60 and 13,040.80

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Solution

The fourth proportional to 20,986.72, 28,975.60 and 13,040.80 is: 18,004.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.72 : 28,975.60 = 13,040.80 : x
  2. Step 2: Convert to fraction form
    20,986.72/28,975.60 = 13,040.80/x
  3. Step 3: Cross multiply
    20,986.72x = 28,975.60 × 13,040.80
  4. Step 4: Simplify right side
    20,986.72x = 377,865,004.48
  5. Step 5: Solve for x
    x = 377,865,004.48/20,986.72
  6. Step 6: Final answer
    x = 18,004.96

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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.