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Finding the Fourth Proportional to 139,481.20, 192,482.86 and 75,818.80

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Solution

The fourth proportional to 139,481.20, 192,482.86 and 75,818.80 is: 104,629.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,481.20 : 192,482.86 = 75,818.80 : x
  2. Step 2: Convert to fraction form
    139,481.20/192,482.86 = 75,818.80/x
  3. Step 3: Cross multiply
    139,481.20x = 192,482.86 × 75,818.80
  4. Step 4: Simplify right side
    139,481.20x = 14,593,819,465.77
  5. Step 5: Solve for x
    x = 14,593,819,465.77/139,481.20
  6. Step 6: Final answer
    x = 104,629.29

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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.