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Finding the Fourth Proportional to 139,390.84, 192,316.98 and 78,951.88

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Solution

The fourth proportional to 139,390.84, 192,316.98 and 78,951.88 is: 108,929.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,390.84 : 192,316.98 = 78,951.88 : x
  2. Step 2: Convert to fraction form
    139,390.84/192,316.98 = 78,951.88/x
  3. Step 3: Cross multiply
    139,390.84x = 192,316.98 × 78,951.88
  4. Step 4: Simplify right side
    139,390.84x = 15,183,787,126.92
  5. Step 5: Solve for x
    x = 15,183,787,126.92/139,390.84
  6. Step 6: Final answer
    x = 108,929.59

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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.