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Finding the Fourth Proportional to 81,211.80, 121,932.90 and 50,107.80

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Solution

The fourth proportional to 81,211.80, 121,932.90 and 50,107.80 is: 75,232.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,211.80 : 121,932.90 = 50,107.80 : x
  2. Step 2: Convert to fraction form
    81,211.80/121,932.90 = 50,107.80/x
  3. Step 3: Cross multiply
    81,211.80x = 121,932.90 × 50,107.80
  4. Step 4: Simplify right side
    81,211.80x = 6,109,789,366.62
  5. Step 5: Solve for x
    x = 6,109,789,366.62/81,211.80
  6. Step 6: Final answer
    x = 75,232.78

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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.