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Finding the Fourth Proportional to 92,918.60, 128,238.66 and 55,193

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Solution

The fourth proportional to 92,918.60, 128,238.66 and 55,193 is: 76,172.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,918.60 : 128,238.66 = 55,193 : x
  2. Step 2: Convert to fraction form
    92,918.60/128,238.66 = 55,193/x
  3. Step 3: Cross multiply
    92,918.60x = 128,238.66 × 55,193
  4. Step 4: Simplify right side
    92,918.60x = 7,077,876,361.38
  5. Step 5: Solve for x
    x = 7,077,876,361.38/92,918.60
  6. Step 6: Final answer
    x = 76,172.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.