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Finding the Fourth Proportional to 139,661.39, 192,681.01 and 85,234.25

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Solution

The fourth proportional to 139,661.39, 192,681.01 and 85,234.25 is: 117,591.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,661.39 : 192,681.01 = 85,234.25 : x
  2. Step 2: Convert to fraction form
    139,661.39/192,681.01 = 85,234.25/x
  3. Step 3: Cross multiply
    139,661.39x = 192,681.01 × 85,234.25
  4. Step 4: Simplify right side
    139,661.39x = 16,423,021,964.84
  5. Step 5: Solve for x
    x = 16,423,021,964.84/139,661.39
  6. Step 6: Final answer
    x = 117,591.71

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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.