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Finding the Fourth Proportional to 138,940.94, 208,240.42 and 79,019.70

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Solution

The fourth proportional to 138,940.94, 208,240.42 and 79,019.70 is: 118,432.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,940.94 : 208,240.42 = 79,019.70 : x
  2. Step 2: Convert to fraction form
    138,940.94/208,240.42 = 79,019.70/x
  3. Step 3: Cross multiply
    138,940.94x = 208,240.42 × 79,019.70
  4. Step 4: Simplify right side
    138,940.94x = 16,455,095,516.27
  5. Step 5: Solve for x
    x = 16,455,095,516.27/138,940.94
  6. Step 6: Final answer
    x = 118,432.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.