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Finding the Fourth Proportional to 128,680.68, 193,086.84 and 61,289.04

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Solution

The fourth proportional to 128,680.68, 193,086.84 and 61,289.04 is: 91,964.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,680.68 : 193,086.84 = 61,289.04 : x
  2. Step 2: Convert to fraction form
    128,680.68/193,086.84 = 61,289.04/x
  3. Step 3: Cross multiply
    128,680.68x = 193,086.84 × 61,289.04
  4. Step 4: Simplify right side
    128,680.68x = 11,834,107,060.23
  5. Step 5: Solve for x
    x = 11,834,107,060.23/128,680.68
  6. Step 6: Final answer
    x = 91,964.91

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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.