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Finding the Fourth Proportional to 139,396.84, 192,325.26 and 78,957.88

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Solution

The fourth proportional to 139,396.84, 192,325.26 and 78,957.88 is: 108,937.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,396.84 : 192,325.26 = 78,957.88 : x
  2. Step 2: Convert to fraction form
    139,396.84/192,325.26 = 78,957.88/x
  3. Step 3: Cross multiply
    139,396.84x = 192,325.26 × 78,957.88
  4. Step 4: Simplify right side
    139,396.84x = 15,185,594,800.05
  5. Step 5: Solve for x
    x = 15,185,594,800.05/139,396.84
  6. Step 6: Final answer
    x = 108,937.87

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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.