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Finding the Fourth Proportional to 85,578.56, 128,290.08 and 38,805.92

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Solution

The fourth proportional to 85,578.56, 128,290.08 and 38,805.92 is: 58,173.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,578.56 : 128,290.08 = 38,805.92 : x
  2. Step 2: Convert to fraction form
    85,578.56/128,290.08 = 38,805.92/x
  3. Step 3: Cross multiply
    85,578.56x = 128,290.08 × 38,805.92
  4. Step 4: Simplify right side
    85,578.56x = 4,978,414,581.27
  5. Step 5: Solve for x
    x = 4,978,414,581.27/85,578.56
  6. Step 6: Final answer
    x = 58,173.62

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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.