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Finding the Fourth Proportional to 85,697.80, 128,595.32 and 33,111

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Solution

The fourth proportional to 85,697.80, 128,595.32 and 33,111 is: 49,685.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,697.80 : 128,595.32 = 33,111 : x
  2. Step 2: Convert to fraction form
    85,697.80/128,595.32 = 33,111/x
  3. Step 3: Cross multiply
    85,697.80x = 128,595.32 × 33,111
  4. Step 4: Simplify right side
    85,697.80x = 4,257,919,640.52
  5. Step 5: Solve for x
    x = 4,257,919,640.52/85,697.80
  6. Step 6: Final answer
    x = 49,685.29

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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.