Home / 80,808.40-121,234.20-72,103.60

Finding the Fourth Proportional to 80,808.40, 121,234.20 and 72,103.60

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Solution

The fourth proportional to 80,808.40, 121,234.20 and 72,103.60 is: 108,174.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,808.40 : 121,234.20 = 72,103.60 : x
  2. Step 2: Convert to fraction form
    80,808.40/121,234.20 = 72,103.60/x
  3. Step 3: Cross multiply
    80,808.40x = 121,234.20 × 72,103.60
  4. Step 4: Simplify right side
    80,808.40x = 8,741,422,263.12
  5. Step 5: Solve for x
    x = 8,741,422,263.12/80,808.40
  6. Step 6: Final answer
    x = 108,174.67

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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.