Home / 81,324.12-121,956.20-28,000.92

Finding the Fourth Proportional to 81,324.12, 121,956.20 and 28,000.92

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Solution

The fourth proportional to 81,324.12, 121,956.20 and 28,000.92 is: 41,991.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,324.12 : 121,956.20 = 28,000.92 : x
  2. Step 2: Convert to fraction form
    81,324.12/121,956.20 = 28,000.92/x
  3. Step 3: Cross multiply
    81,324.12x = 121,956.20 × 28,000.92
  4. Step 4: Simplify right side
    81,324.12x = 3,414,885,799.70
  5. Step 5: Solve for x
    x = 3,414,885,799.70/81,324.12
  6. Step 6: Final answer
    x = 41,991.06

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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.