Home / 81,249.15-121,861.37-31,321.96

Finding the Fourth Proportional to 81,249.15, 121,861.37 and 31,321.96

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Solution

The fourth proportional to 81,249.15, 121,861.37 and 31,321.96 is: 46,978.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,249.15 : 121,861.37 = 31,321.96 : x
  2. Step 2: Convert to fraction form
    81,249.15/121,861.37 = 31,321.96/x
  3. Step 3: Cross multiply
    81,249.15x = 121,861.37 × 31,321.96
  4. Step 4: Simplify right side
    81,249.15x = 3,816,936,800.08
  5. Step 5: Solve for x
    x = 3,816,936,800.08/81,249.15
  6. Step 6: Final answer
    x = 46,978.18

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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.