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Finding the Fourth Proportional to 291,107.91, 436,661.87 and 80,745.84

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Solution

The fourth proportional to 291,107.91, 436,661.87 and 80,745.84 is: 121,118.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,107.91 : 436,661.87 = 80,745.84 : x
  2. Step 2: Convert to fraction form
    291,107.91/436,661.87 = 80,745.84/x
  3. Step 3: Cross multiply
    291,107.91x = 436,661.87 × 80,745.84
  4. Step 4: Simplify right side
    291,107.91x = 35,258,629,085.39
  5. Step 5: Solve for x
    x = 35,258,629,085.39/291,107.91
  6. Step 6: Final answer
    x = 121,118.76

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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.