Home / 3,831.18-5,286.87-2,129.63

Finding the Fourth Proportional to 3,831.18, 5,286.87 and 2,129.63

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Solution

The fourth proportional to 3,831.18, 5,286.87 and 2,129.63 is: 2,938.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,831.18 : 5,286.87 = 2,129.63 : x
  2. Step 2: Convert to fraction form
    3,831.18/5,286.87 = 2,129.63/x
  3. Step 3: Cross multiply
    3,831.18x = 5,286.87 × 2,129.63
  4. Step 4: Simplify right side
    3,831.18x = 11,259,050.52
  5. Step 5: Solve for x
    x = 11,259,050.52/3,831.18
  6. Step 6: Final answer
    x = 2,938.79

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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.