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Finding the Fourth Proportional to 115,761.81, 159,771.79 and 68,015.15

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Solution

The fourth proportional to 115,761.81, 159,771.79 and 68,015.15 is: 93,872.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,761.81 : 159,771.79 = 68,015.15 : x
  2. Step 2: Convert to fraction form
    115,761.81/159,771.79 = 68,015.15/x
  3. Step 3: Cross multiply
    115,761.81x = 159,771.79 × 68,015.15
  4. Step 4: Simplify right side
    115,761.81x = 10,866,902,262.62
  5. Step 5: Solve for x
    x = 10,866,902,262.62/115,761.81
  6. Step 6: Final answer
    x = 93,872.95

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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.