Home / 2,555.60-3,831.12-911.78

Finding the Fourth Proportional to 2,555.60, 3,831.12 and 911.78

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Solution

The fourth proportional to 2,555.60, 3,831.12 and 911.78 is: 1,366.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,555.60 : 3,831.12 = 911.78 : x
  2. Step 2: Convert to fraction form
    2,555.60/3,831.12 = 911.78/x
  3. Step 3: Cross multiply
    2,555.60x = 3,831.12 × 911.78
  4. Step 4: Simplify right side
    2,555.60x = 3,493,147.14
  5. Step 5: Solve for x
    x = 3,493,147.14/2,555.60
  6. Step 6: Final answer
    x = 1,366.86

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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.