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Finding the Fourth Proportional to 139,695.58, 192,784.06 and 86,011.56

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Solution

The fourth proportional to 139,695.58, 192,784.06 and 86,011.56 is: 118,698.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,695.58 : 192,784.06 = 86,011.56 : x
  2. Step 2: Convert to fraction form
    139,695.58/192,784.06 = 86,011.56/x
  3. Step 3: Cross multiply
    139,695.58x = 192,784.06 × 86,011.56
  4. Step 4: Simplify right side
    139,695.58x = 16,581,657,528.70
  5. Step 5: Solve for x
    x = 16,581,657,528.70/139,695.58
  6. Step 6: Final answer
    x = 118,698.51

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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.