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Finding the Fourth Proportional to 57,805.86, 86,715.72 and 20,358.18

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Solution

The fourth proportional to 57,805.86, 86,715.72 and 20,358.18 is: 30,539.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,805.86 : 86,715.72 = 20,358.18 : x
  2. Step 2: Convert to fraction form
    57,805.86/86,715.72 = 20,358.18/x
  3. Step 3: Cross multiply
    57,805.86x = 86,715.72 × 20,358.18
  4. Step 4: Simplify right side
    57,805.86x = 1,765,374,236.59
  5. Step 5: Solve for x
    x = 1,765,374,236.59/57,805.86
  6. Step 6: Final answer
    x = 30,539.71

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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.