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Finding the Fourth Proportional to 139,158.81, 192,048.67 and 78,729.44

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Solution

The fourth proportional to 139,158.81, 192,048.67 and 78,729.44 is: 108,652.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,158.81 : 192,048.67 = 78,729.44 : x
  2. Step 2: Convert to fraction form
    139,158.81/192,048.67 = 78,729.44/x
  3. Step 3: Cross multiply
    139,158.81x = 192,048.67 × 78,729.44
  4. Step 4: Simplify right side
    139,158.81x = 15,119,883,785.12
  5. Step 5: Solve for x
    x = 15,119,883,785.12/139,158.81
  6. Step 6: Final answer
    x = 108,652.01

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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.