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Finding the Fourth Proportional to 127,785.60, 191,908.80 and 123,638.40

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Solution

The fourth proportional to 127,785.60, 191,908.80 and 123,638.40 is: 185,680.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,785.60 : 191,908.80 = 123,638.40 : x
  2. Step 2: Convert to fraction form
    127,785.60/191,908.80 = 123,638.40/x
  3. Step 3: Cross multiply
    127,785.60x = 191,908.80 × 123,638.40
  4. Step 4: Simplify right side
    127,785.60x = 23,727,296,977.92
  5. Step 5: Solve for x
    x = 23,727,296,977.92/127,785.60
  6. Step 6: Final answer
    x = 185,680.52

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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.