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Finding the Fourth Proportional to 139,406.24, 192,393.16 and 78,991.58

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Solution

The fourth proportional to 139,406.24, 192,393.16 and 78,991.58 is: 109,015.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,406.24 : 192,393.16 = 78,991.58 : x
  2. Step 2: Convert to fraction form
    139,406.24/192,393.16 = 78,991.58/x
  3. Step 3: Cross multiply
    139,406.24x = 192,393.16 × 78,991.58
  4. Step 4: Simplify right side
    139,406.24x = 15,197,439,689.59
  5. Step 5: Solve for x
    x = 15,197,439,689.59/139,406.24
  6. Step 6: Final answer
    x = 109,015.49

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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.