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Finding the Fourth Proportional to 139,672.76, 192,752.78 and 79,245.95

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Solution

The fourth proportional to 139,672.76, 192,752.78 and 79,245.95 is: 109,361.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,672.76 : 192,752.78 = 79,245.95 : x
  2. Step 2: Convert to fraction form
    139,672.76/192,752.78 = 79,245.95/x
  3. Step 3: Cross multiply
    139,672.76x = 192,752.78 × 79,245.95
  4. Step 4: Simplify right side
    139,672.76x = 15,274,875,806.25
  5. Step 5: Solve for x
    x = 15,274,875,806.25/139,672.76
  6. Step 6: Final answer
    x = 109,361.89

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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.