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Finding the Fourth Proportional to 85,793.58, 128,638.26 and 38,399.67

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Solution

The fourth proportional to 85,793.58, 128,638.26 and 38,399.67 is: 57,576.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,793.58 : 128,638.26 = 38,399.67 : x
  2. Step 2: Convert to fraction form
    85,793.58/128,638.26 = 38,399.67/x
  3. Step 3: Cross multiply
    85,793.58x = 128,638.26 × 38,399.67
  4. Step 4: Simplify right side
    85,793.58x = 4,939,666,733.37
  5. Step 5: Solve for x
    x = 4,939,666,733.37/85,793.58
  6. Step 6: Final answer
    x = 57,576.18

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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.