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Finding the Fourth Proportional to 85,905.41, 128,806.33 and 38,511.92

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Solution

The fourth proportional to 85,905.41, 128,806.33 and 38,511.92 is: 57,744.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,905.41 : 128,806.33 = 38,511.92 : x
  2. Step 2: Convert to fraction form
    85,905.41/128,806.33 = 38,511.92/x
  3. Step 3: Cross multiply
    85,905.41x = 128,806.33 × 38,511.92
  4. Step 4: Simplify right side
    85,905.41x = 4,960,578,336.14
  5. Step 5: Solve for x
    x = 4,960,578,336.14/85,905.41
  6. Step 6: Final answer
    x = 57,744.66

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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.