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Finding the Fourth Proportional to 2,639.86, 3,959.92 and 885.02

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Solution

The fourth proportional to 2,639.86, 3,959.92 and 885.02 is: 1,327.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.86 : 3,959.92 = 885.02 : x
  2. Step 2: Convert to fraction form
    2,639.86/3,959.92 = 885.02/x
  3. Step 3: Cross multiply
    2,639.86x = 3,959.92 × 885.02
  4. Step 4: Simplify right side
    2,639.86x = 3,504,608.40
  5. Step 5: Solve for x
    x = 3,504,608.40/2,639.86
  6. Step 6: Final answer
    x = 1,327.57

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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.