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Finding the Fourth Proportional to 138,999.57, 191,817.33 and 78,568.09

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Solution

The fourth proportional to 138,999.57, 191,817.33 and 78,568.09 is: 108,422.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,999.57 : 191,817.33 = 78,568.09 : x
  2. Step 2: Convert to fraction form
    138,999.57/191,817.33 = 78,568.09/x
  3. Step 3: Cross multiply
    138,999.57x = 191,817.33 × 78,568.09
  4. Step 4: Simplify right side
    138,999.57x = 15,070,720,853.06
  5. Step 5: Solve for x
    x = 15,070,720,853.06/138,999.57
  6. Step 6: Final answer
    x = 108,422.79

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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.