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Finding the Fourth Proportional to 71,669.51, 107,489.84 and 68,112.90

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Solution

The fourth proportional to 71,669.51, 107,489.84 and 68,112.90 is: 102,155.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,669.51 : 107,489.84 = 68,112.90 : x
  2. Step 2: Convert to fraction form
    71,669.51/107,489.84 = 68,112.90/x
  3. Step 3: Cross multiply
    71,669.51x = 107,489.84 × 68,112.90
  4. Step 4: Simplify right side
    71,669.51x = 7,321,444,382.37
  5. Step 5: Solve for x
    x = 7,321,444,382.37/71,669.51
  6. Step 6: Final answer
    x = 102,155.64

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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.