Home / 81,272.20-121,908.30-80,105.80

Finding the Fourth Proportional to 81,272.20, 121,908.30 and 80,105.80

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Solution

The fourth proportional to 81,272.20, 121,908.30 and 80,105.80 is: 120,158.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,272.20 : 121,908.30 = 80,105.80 : x
  2. Step 2: Convert to fraction form
    81,272.20/121,908.30 = 80,105.80/x
  3. Step 3: Cross multiply
    81,272.20x = 121,908.30 × 80,105.80
  4. Step 4: Simplify right side
    81,272.20x = 9,765,561,898.14
  5. Step 5: Solve for x
    x = 9,765,561,898.14/81,272.20
  6. Step 6: Final answer
    x = 120,158.70

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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.