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Finding the Fourth Proportional to 2,679.94, 4,020.49 and 831.02

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Solution

The fourth proportional to 2,679.94, 4,020.49 and 831.02 is: 1,246.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,679.94 : 4,020.49 = 831.02 : x
  2. Step 2: Convert to fraction form
    2,679.94/4,020.49 = 831.02/x
  3. Step 3: Cross multiply
    2,679.94x = 4,020.49 × 831.02
  4. Step 4: Simplify right side
    2,679.94x = 3,341,083.34
  5. Step 5: Solve for x
    x = 3,341,083.34/2,679.94
  6. Step 6: Final answer
    x = 1,246.70

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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.