Home / 20,518.20-30,791.70-13,140.60

Finding the Fourth Proportional to 20,518.20, 30,791.70 and 13,140.60

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Solution

The fourth proportional to 20,518.20, 30,791.70 and 13,140.60 is: 19,720.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,518.20 : 30,791.70 = 13,140.60 : x
  2. Step 2: Convert to fraction form
    20,518.20/30,791.70 = 13,140.60/x
  3. Step 3: Cross multiply
    20,518.20x = 30,791.70 × 13,140.60
  4. Step 4: Simplify right side
    20,518.20x = 404,621,413.02
  5. Step 5: Solve for x
    x = 404,621,413.02/20,518.20
  6. Step 6: Final answer
    x = 19,720.12

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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.