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Finding the Fourth Proportional to 128,199.89, 176,912.12 and 70,838.30

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Solution

The fourth proportional to 128,199.89, 176,912.12 and 70,838.30 is: 97,754.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,199.89 : 176,912.12 = 70,838.30 : x
  2. Step 2: Convert to fraction form
    128,199.89/176,912.12 = 70,838.30/x
  3. Step 3: Cross multiply
    128,199.89x = 176,912.12 × 70,838.30
  4. Step 4: Simplify right side
    128,199.89x = 12,532,152,591.44
  5. Step 5: Solve for x
    x = 12,532,152,591.44/128,199.89
  6. Step 6: Final answer
    x = 97,754.79

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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.