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Finding the Fourth Proportional to 139,162.81, 192,054.19 and 78,733.44

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Solution

The fourth proportional to 139,162.81, 192,054.19 and 78,733.44 is: 108,657.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,162.81 : 192,054.19 = 78,733.44 : x
  2. Step 2: Convert to fraction form
    139,162.81/192,054.19 = 78,733.44/x
  3. Step 3: Cross multiply
    139,162.81x = 192,054.19 × 78,733.44
  4. Step 4: Simplify right side
    139,162.81x = 15,121,087,045.11
  5. Step 5: Solve for x
    x = 15,121,087,045.11/139,162.81
  6. Step 6: Final answer
    x = 108,657.53

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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.