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Finding the Fourth Proportional to 118,269.20, 177,112.20 and 78,611.60

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Solution

The fourth proportional to 118,269.20, 177,112.20 and 78,611.60 is: 117,723.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,269.20 : 177,112.20 = 78,611.60 : x
  2. Step 2: Convert to fraction form
    118,269.20/177,112.20 = 78,611.60/x
  3. Step 3: Cross multiply
    118,269.20x = 177,112.20 × 78,611.60
  4. Step 4: Simplify right side
    118,269.20x = 13,923,073,421.52
  5. Step 5: Solve for x
    x = 13,923,073,421.52/118,269.20
  6. Step 6: Final answer
    x = 117,723.58

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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.