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Finding the Fourth Proportional to 139,794.20, 192,909.40 and 79,356.86

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Solution

The fourth proportional to 139,794.20, 192,909.40 and 79,356.86 is: 109,508.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,794.20 : 192,909.40 = 79,356.86 : x
  2. Step 2: Convert to fraction form
    139,794.20/192,909.40 = 79,356.86/x
  3. Step 3: Cross multiply
    139,794.20x = 192,909.40 × 79,356.86
  4. Step 4: Simplify right side
    139,794.20x = 15,308,684,248.48
  5. Step 5: Solve for x
    x = 15,308,684,248.48/139,794.20
  6. Step 6: Final answer
    x = 109,508.72

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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.