Home / 3,831.19-5,286.93-2,152.78

Finding the Fourth Proportional to 3,831.19, 5,286.93 and 2,152.78

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Solution

The fourth proportional to 3,831.19, 5,286.93 and 2,152.78 is: 2,970.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,831.19 : 5,286.93 = 2,152.78 : x
  2. Step 2: Convert to fraction form
    3,831.19/5,286.93 = 2,152.78/x
  3. Step 3: Cross multiply
    3,831.19x = 5,286.93 × 2,152.78
  4. Step 4: Simplify right side
    3,831.19x = 11,381,597.17
  5. Step 5: Solve for x
    x = 11,381,597.17/3,831.19
  6. Step 6: Final answer
    x = 2,970.77

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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.