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Finding the Fourth Proportional to 139,706.11, 192,789.08 and 79,273.15

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Solution

The fourth proportional to 139,706.11, 192,789.08 and 79,273.15 is: 109,393.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,706.11 : 192,789.08 = 79,273.15 : x
  2. Step 2: Convert to fraction form
    139,706.11/192,789.08 = 79,273.15/x
  3. Step 3: Cross multiply
    139,706.11x = 192,789.08 × 79,273.15
  4. Step 4: Simplify right side
    139,706.11x = 15,282,997,373.41
  5. Step 5: Solve for x
    x = 15,282,997,373.41/139,706.11
  6. Step 6: Final answer
    x = 109,393.91

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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.