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Finding the Fourth Proportional to 118,287.20, 177,139.20 and 78,629.60

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Solution

The fourth proportional to 118,287.20, 177,139.20 and 78,629.60 is: 117,750.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,287.20 : 177,139.20 = 78,629.60 : x
  2. Step 2: Convert to fraction form
    118,287.20/177,139.20 = 78,629.60/x
  3. Step 3: Cross multiply
    118,287.20x = 177,139.20 × 78,629.60
  4. Step 4: Simplify right side
    118,287.20x = 13,928,384,440.32
  5. Step 5: Solve for x
    x = 13,928,384,440.32/118,287.20
  6. Step 6: Final answer
    x = 117,750.56

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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.