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Finding the Fourth Proportional to 139,758.57, 192,869.16 and 79,331.08

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Solution

The fourth proportional to 139,758.57, 192,869.16 and 79,331.08 is: 109,478.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,758.57 : 192,869.16 = 79,331.08 : x
  2. Step 2: Convert to fraction form
    139,758.57/192,869.16 = 79,331.08/x
  3. Step 3: Cross multiply
    139,758.57x = 192,869.16 × 79,331.08
  4. Step 4: Simplify right side
    139,758.57x = 15,300,517,797.15
  5. Step 5: Solve for x
    x = 15,300,517,797.15/139,758.57
  6. Step 6: Final answer
    x = 109,478.21

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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.