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Finding the Fourth Proportional to 78,620.40, 108,504.81 and 48,399.66

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Solution

The fourth proportional to 78,620.40, 108,504.81 and 48,399.66 is: 66,796.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,620.40 : 108,504.81 = 48,399.66 : x
  2. Step 2: Convert to fraction form
    78,620.40/108,504.81 = 48,399.66/x
  3. Step 3: Cross multiply
    78,620.40x = 108,504.81 × 48,399.66
  4. Step 4: Simplify right side
    78,620.40x = 5,251,595,912.36
  5. Step 5: Solve for x
    x = 5,251,595,912.36/78,620.40
  6. Step 6: Final answer
    x = 66,796.86

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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.