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Finding the Fourth Proportional to 101,979.54, 140,751.90 and 65,162.21

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Solution

The fourth proportional to 101,979.54, 140,751.90 and 65,162.21 is: 89,936.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,979.54 : 140,751.90 = 65,162.21 : x
  2. Step 2: Convert to fraction form
    101,979.54/140,751.90 = 65,162.21/x
  3. Step 3: Cross multiply
    101,979.54x = 140,751.90 × 65,162.21
  4. Step 4: Simplify right side
    101,979.54x = 9,171,704,161.94
  5. Step 5: Solve for x
    x = 9,171,704,161.94/101,979.54
  6. Step 6: Final answer
    x = 89,936.71

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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.