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Finding the Fourth Proportional to 139,672.70, 192,752.70 and 79,245.89

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Solution

The fourth proportional to 139,672.70, 192,752.70 and 79,245.89 is: 109,361.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,672.70 : 192,752.70 = 79,245.89 : x
  2. Step 2: Convert to fraction form
    139,672.70/192,752.70 = 79,245.89/x
  3. Step 3: Cross multiply
    139,672.70x = 192,752.70 × 79,245.89
  4. Step 4: Simplify right side
    139,672.70x = 15,274,860,476.16
  5. Step 5: Solve for x
    x = 15,274,860,476.16/139,672.70
  6. Step 6: Final answer
    x = 109,361.82

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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.