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Finding the Fourth Proportional to 139,158.76, 192,048.74 and 78,729.64

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Solution

The fourth proportional to 139,158.76, 192,048.74 and 78,729.64 is: 108,652.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,158.76 : 192,048.74 = 78,729.64 : x
  2. Step 2: Convert to fraction form
    139,158.76/192,048.74 = 78,729.64/x
  3. Step 3: Cross multiply
    139,158.76x = 192,048.74 × 78,729.64
  4. Step 4: Simplify right side
    139,158.76x = 15,119,928,162.65
  5. Step 5: Solve for x
    x = 15,119,928,162.65/139,158.76
  6. Step 6: Final answer
    x = 108,652.36

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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.