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Finding the Fourth Proportional to 185,611.92, 256,144.32 and 100,728.78

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Solution

The fourth proportional to 185,611.92, 256,144.32 and 100,728.78 is: 139,005.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    185,611.92 : 256,144.32 = 100,728.78 : x
  2. Step 2: Convert to fraction form
    185,611.92/256,144.32 = 100,728.78/x
  3. Step 3: Cross multiply
    185,611.92x = 256,144.32 × 100,728.78
  4. Step 4: Simplify right side
    185,611.92x = 25,801,104,857.53
  5. Step 5: Solve for x
    x = 25,801,104,857.53/185,611.92
  6. Step 6: Final answer
    x = 139,005.65

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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.