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Finding the Fourth Proportional to 138,393.56, 191,014.20 and 90,619.16

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Solution

The fourth proportional to 138,393.56, 191,014.20 and 90,619.16 is: 125,074.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,393.56 : 191,014.20 = 90,619.16 : x
  2. Step 2: Convert to fraction form
    138,393.56/191,014.20 = 90,619.16/x
  3. Step 3: Cross multiply
    138,393.56x = 191,014.20 × 90,619.16
  4. Step 4: Simplify right side
    138,393.56x = 17,309,546,352.07
  5. Step 5: Solve for x
    x = 17,309,546,352.07/138,393.56
  6. Step 6: Final answer
    x = 125,074.80

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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.