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Finding the Fourth Proportional to 6,639.86, 9,955.13 and 2,940.09

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Solution

The fourth proportional to 6,639.86, 9,955.13 and 2,940.09 is: 4,408.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,639.86 : 9,955.13 = 2,940.09 : x
  2. Step 2: Convert to fraction form
    6,639.86/9,955.13 = 2,940.09/x
  3. Step 3: Cross multiply
    6,639.86x = 9,955.13 × 2,940.09
  4. Step 4: Simplify right side
    6,639.86x = 29,268,978.16
  5. Step 5: Solve for x
    x = 29,268,978.16/6,639.86
  6. Step 6: Final answer
    x = 4,408.07

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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.