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Finding the Fourth Proportional to 85,765.92, 128,684.12 and 35,856.56

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Solution

The fourth proportional to 85,765.92, 128,684.12 and 35,856.56 is: 53,799.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,765.92 : 128,684.12 = 35,856.56 : x
  2. Step 2: Convert to fraction form
    85,765.92/128,684.12 = 35,856.56/x
  3. Step 3: Cross multiply
    85,765.92x = 128,684.12 × 35,856.56
  4. Step 4: Simplify right side
    85,765.92x = 4,614,169,047.12
  5. Step 5: Solve for x
    x = 4,614,169,047.12/85,765.92
  6. Step 6: Final answer
    x = 53,799.56

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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.