Home / 3,221.20-4,831.80-2,126.80

Finding the Fourth Proportional to 3,221.20, 4,831.80 and 2,126.80

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Solution

The fourth proportional to 3,221.20, 4,831.80 and 2,126.80 is: 3,190.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,221.20 : 4,831.80 = 2,126.80 : x
  2. Step 2: Convert to fraction form
    3,221.20/4,831.80 = 2,126.80/x
  3. Step 3: Cross multiply
    3,221.20x = 4,831.80 × 2,126.80
  4. Step 4: Simplify right side
    3,221.20x = 10,276,272.24
  5. Step 5: Solve for x
    x = 10,276,272.24/3,221.20
  6. Step 6: Final answer
    x = 3,190.20

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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.