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Finding the Fourth Proportional to 85,936.80, 128,540.70 and 77,115.90

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Solution

The fourth proportional to 85,936.80, 128,540.70 and 77,115.90 is: 115,346.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,936.80 : 128,540.70 = 77,115.90 : x
  2. Step 2: Convert to fraction form
    85,936.80/128,540.70 = 77,115.90/x
  3. Step 3: Cross multiply
    85,936.80x = 128,540.70 × 77,115.90
  4. Step 4: Simplify right side
    85,936.80x = 9,912,531,767.13
  5. Step 5: Solve for x
    x = 9,912,531,767.13/85,936.80
  6. Step 6: Final answer
    x = 115,346.76

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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.