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Finding the Fourth Proportional to 139,251.29, 192,112.95 and 78,808.07

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Solution

The fourth proportional to 139,251.29, 192,112.95 and 78,808.07 is: 108,724.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,251.29 : 192,112.95 = 78,808.07 : x
  2. Step 2: Convert to fraction form
    139,251.29/192,112.95 = 78,808.07/x
  3. Step 3: Cross multiply
    139,251.29x = 192,112.95 × 78,808.07
  4. Step 4: Simplify right side
    139,251.29x = 15,140,050,811.51
  5. Step 5: Solve for x
    x = 15,140,050,811.51/139,251.29
  6. Step 6: Final answer
    x = 108,724.67

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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.