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Finding the Fourth Proportional to 139,847.47, 192,984.01 and 85,490.66

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Solution

The fourth proportional to 139,847.47, 192,984.01 and 85,490.66 is: 117,973.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,847.47 : 192,984.01 = 85,490.66 : x
  2. Step 2: Convert to fraction form
    139,847.47/192,984.01 = 85,490.66/x
  3. Step 3: Cross multiply
    139,847.47x = 192,984.01 × 85,490.66
  4. Step 4: Simplify right side
    139,847.47x = 16,498,330,653.08
  5. Step 5: Solve for x
    x = 16,498,330,653.08/139,847.47
  6. Step 6: Final answer
    x = 117,973.75

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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.