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Finding the Fourth Proportional to 85,355.70, 128,021.40 and 29,198.40

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Solution

The fourth proportional to 85,355.70, 128,021.40 and 29,198.40 is: 43,793.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,355.70 : 128,021.40 = 29,198.40 : x
  2. Step 2: Convert to fraction form
    85,355.70/128,021.40 = 29,198.40/x
  3. Step 3: Cross multiply
    85,355.70x = 128,021.40 × 29,198.40
  4. Step 4: Simplify right side
    85,355.70x = 3,738,020,045.76
  5. Step 5: Solve for x
    x = 3,738,020,045.76/85,355.70
  6. Step 6: Final answer
    x = 43,793.44

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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.