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Finding the Fourth Proportional to 2,911.02, 4,366.20 and 831.20

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Solution

The fourth proportional to 2,911.02, 4,366.20 and 831.20 is: 1,246.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,911.02 : 4,366.20 = 831.20 : x
  2. Step 2: Convert to fraction form
    2,911.02/4,366.20 = 831.20/x
  3. Step 3: Cross multiply
    2,911.02x = 4,366.20 × 831.20
  4. Step 4: Simplify right side
    2,911.02x = 3,629,185.44
  5. Step 5: Solve for x
    x = 3,629,185.44/2,911.02
  6. Step 6: Final answer
    x = 1,246.71

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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.