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Finding the Fourth Proportional to 139,281.30, 192,212.46 and 78,850.80

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Solution

The fourth proportional to 139,281.30, 192,212.46 and 78,850.80 is: 108,816.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,281.30 : 192,212.46 = 78,850.80 : x
  2. Step 2: Convert to fraction form
    139,281.30/192,212.46 = 78,850.80/x
  3. Step 3: Cross multiply
    139,281.30x = 192,212.46 × 78,850.80
  4. Step 4: Simplify right side
    139,281.30x = 15,156,106,240.97
  5. Step 5: Solve for x
    x = 15,156,106,240.97/139,281.30
  6. Step 6: Final answer
    x = 108,816.52

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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.