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Finding the Fourth Proportional to 85,578.96, 128,398.86 and 38,189.75

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Solution

The fourth proportional to 85,578.96, 128,398.86 and 38,189.75 is: 57,298.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,578.96 : 128,398.86 = 38,189.75 : x
  2. Step 2: Convert to fraction form
    85,578.96/128,398.86 = 38,189.75/x
  3. Step 3: Cross multiply
    85,578.96x = 128,398.86 × 38,189.75
  4. Step 4: Simplify right side
    85,578.96x = 4,903,519,721.69
  5. Step 5: Solve for x
    x = 4,903,519,721.69/85,578.96
  6. Step 6: Final answer
    x = 57,298.19

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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.