Home / 2,129.21-3,194.20-879.80

Finding the Fourth Proportional to 2,129.21, 3,194.20 and 879.80

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Solution

The fourth proportional to 2,129.21, 3,194.20 and 879.80 is: 1,319.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.21 : 3,194.20 = 879.80 : x
  2. Step 2: Convert to fraction form
    2,129.21/3,194.20 = 879.80/x
  3. Step 3: Cross multiply
    2,129.21x = 3,194.20 × 879.80
  4. Step 4: Simplify right side
    2,129.21x = 2,810,255.31
  5. Step 5: Solve for x
    x = 2,810,255.31/2,129.21
  6. Step 6: Final answer
    x = 1,319.86

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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.