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Finding the Fourth Proportional to 8,639.88, 11,921.78 and 5,004.55

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Solution

The fourth proportional to 8,639.88, 11,921.78 and 5,004.55 is: 6,905.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,639.88 : 11,921.78 = 5,004.55 : x
  2. Step 2: Convert to fraction form
    8,639.88/11,921.78 = 5,004.55/x
  3. Step 3: Cross multiply
    8,639.88x = 11,921.78 × 5,004.55
  4. Step 4: Simplify right side
    8,639.88x = 59,663,171.51
  5. Step 5: Solve for x
    x = 59,663,171.51/8,639.88
  6. Step 6: Final answer
    x = 6,905.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.