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Finding the Fourth Proportional to 139,126.22, 191,994.19 and 78,695.56

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Solution

The fourth proportional to 139,126.22, 191,994.19 and 78,695.56 is: 108,599.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,126.22 : 191,994.19 = 78,695.56 : x
  2. Step 2: Convert to fraction form
    139,126.22/191,994.19 = 78,695.56/x
  3. Step 3: Cross multiply
    139,126.22x = 191,994.19 × 78,695.56
  4. Step 4: Simplify right side
    139,126.22x = 15,109,090,342.05
  5. Step 5: Solve for x
    x = 15,109,090,342.05/139,126.22
  6. Step 6: Final answer
    x = 108,599.88

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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.