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Finding the Fourth Proportional to 139,146.45, 192,022.11 and 78,715.86

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Solution

The fourth proportional to 139,146.45, 192,022.11 and 78,715.86 is: 108,627.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,146.45 : 192,022.11 = 78,715.86 : x
  2. Step 2: Convert to fraction form
    139,146.45/192,022.11 = 78,715.86/x
  3. Step 3: Cross multiply
    139,146.45x = 192,022.11 × 78,715.86
  4. Step 4: Simplify right side
    139,146.45x = 15,115,185,527.66
  5. Step 5: Solve for x
    x = 15,115,185,527.66/139,146.45
  6. Step 6: Final answer
    x = 108,627.89

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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.