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Finding the Fourth Proportional to 118,138.90, 177,074.25 and 103,879.78

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Solution

The fourth proportional to 118,138.90, 177,074.25 and 103,879.78 is: 155,701.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,138.90 : 177,074.25 = 103,879.78 : x
  2. Step 2: Convert to fraction form
    118,138.90/177,074.25 = 103,879.78/x
  3. Step 3: Cross multiply
    118,138.90x = 177,074.25 × 103,879.78
  4. Step 4: Simplify right side
    118,138.90x = 18,394,434,133.67
  5. Step 5: Solve for x
    x = 18,394,434,133.67/118,138.90
  6. Step 6: Final answer
    x = 155,701.76

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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.