Home / 80,856.12-121,321.85-30,919.78

Finding the Fourth Proportional to 80,856.12, 121,321.85 and 30,919.78

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Solution

The fourth proportional to 80,856.12, 121,321.85 and 30,919.78 is: 46,394.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,856.12 : 121,321.85 = 30,919.78 : x
  2. Step 2: Convert to fraction form
    80,856.12/121,321.85 = 30,919.78/x
  3. Step 3: Cross multiply
    80,856.12x = 121,321.85 × 30,919.78
  4. Step 4: Simplify right side
    80,856.12x = 3,751,244,399.73
  5. Step 5: Solve for x
    x = 3,751,244,399.73/80,856.12
  6. Step 6: Final answer
    x = 46,394.07

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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.