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Finding the Fourth Proportional to 139,416.28, 192,394.14 and 78,986.80

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Solution

The fourth proportional to 139,416.28, 192,394.14 and 78,986.80 is: 109,001.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,416.28 : 192,394.14 = 78,986.80 : x
  2. Step 2: Convert to fraction form
    139,416.28/192,394.14 = 78,986.80/x
  3. Step 3: Cross multiply
    139,416.28x = 192,394.14 × 78,986.80
  4. Step 4: Simplify right side
    139,416.28x = 15,196,597,457.35
  5. Step 5: Solve for x
    x = 15,196,597,457.35/139,416.28
  6. Step 6: Final answer
    x = 109,001.60

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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.