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Finding the Fourth Proportional to 129,512.56, 178,753.92 and 81,733.84

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Solution

The fourth proportional to 129,512.56, 178,753.92 and 81,733.84 is: 112,809.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,512.56 : 178,753.92 = 81,733.84 : x
  2. Step 2: Convert to fraction form
    129,512.56/178,753.92 = 81,733.84/x
  3. Step 3: Cross multiply
    129,512.56x = 178,753.92 × 81,733.84
  4. Step 4: Simplify right side
    129,512.56x = 14,610,244,296.65
  5. Step 5: Solve for x
    x = 14,610,244,296.65/129,512.56
  6. Step 6: Final answer
    x = 112,809.48

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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.