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Finding the Fourth Proportional to 139,698.99, 192,778.90 and 79,268.38

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Solution

The fourth proportional to 139,698.99, 192,778.90 and 79,268.38 is: 109,387.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,698.99 : 192,778.90 = 79,268.38 : x
  2. Step 2: Convert to fraction form
    139,698.99/192,778.90 = 79,268.38/x
  3. Step 3: Cross multiply
    139,698.99x = 192,778.90 × 79,268.38
  4. Step 4: Simplify right side
    139,698.99x = 15,281,270,421.06
  5. Step 5: Solve for x
    x = 15,281,270,421.06/139,698.99
  6. Step 6: Final answer
    x = 109,387.12

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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.