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Finding the Fourth Proportional to 2,779, 4,168.64 and 831.22

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Solution

The fourth proportional to 2,779, 4,168.64 and 831.22 is: 1,246.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,779 : 4,168.64 = 831.22 : x
  2. Step 2: Convert to fraction form
    2,779/4,168.64 = 831.22/x
  3. Step 3: Cross multiply
    2,779x = 4,168.64 × 831.22
  4. Step 4: Simplify right side
    2,779x = 3,465,056.94
  5. Step 5: Solve for x
    x = 3,465,056.94/2,779
  6. Step 6: Final answer
    x = 1,246.87

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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.