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Finding the Fourth Proportional to 129,999.80, 194,610.90 and 77,382.20

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Solution

The fourth proportional to 129,999.80, 194,610.90 and 77,382.20 is: 115,841.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,999.80 : 194,610.90 = 77,382.20 : x
  2. Step 2: Convert to fraction form
    129,999.80/194,610.90 = 77,382.20/x
  3. Step 3: Cross multiply
    129,999.80x = 194,610.90 × 77,382.20
  4. Step 4: Simplify right side
    129,999.80x = 15,059,419,585.98
  5. Step 5: Solve for x
    x = 15,059,419,585.98/129,999.80
  6. Step 6: Final answer
    x = 115,841.87

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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.