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Finding the Fourth Proportional to 139,639.50, 192,687.93 and 79,190.82

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Solution

The fourth proportional to 139,639.50, 192,687.93 and 79,190.82 is: 109,275.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,639.50 : 192,687.93 = 79,190.82 : x
  2. Step 2: Convert to fraction form
    139,639.50/192,687.93 = 79,190.82/x
  3. Step 3: Cross multiply
    139,639.50x = 192,687.93 × 79,190.82
  4. Step 4: Simplify right side
    139,639.50x = 15,259,115,180.80
  5. Step 5: Solve for x
    x = 15,259,115,180.80/139,639.50
  6. Step 6: Final answer
    x = 109,275.06

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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.