Home / 80,896.20-121,311.90-28,278.60

Finding the Fourth Proportional to 80,896.20, 121,311.90 and 28,278.60

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Solution

The fourth proportional to 80,896.20, 121,311.90 and 28,278.60 is: 42,406.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,896.20 : 121,311.90 = 28,278.60 : x
  2. Step 2: Convert to fraction form
    80,896.20/121,311.90 = 28,278.60/x
  3. Step 3: Cross multiply
    80,896.20x = 121,311.90 × 28,278.60
  4. Step 4: Simplify right side
    80,896.20x = 3,430,530,695.34
  5. Step 5: Solve for x
    x = 3,430,530,695.34/80,896.20
  6. Step 6: Final answer
    x = 42,406.57

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1.5x scale

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.