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Finding the Fourth Proportional to 118,137.90, 177,072.75 and 103,878.78

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Solution

The fourth proportional to 118,137.90, 177,072.75 and 103,878.78 is: 155,700.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,137.90 : 177,072.75 = 103,878.78 : x
  2. Step 2: Convert to fraction form
    118,137.90/177,072.75 = 103,878.78/x
  3. Step 3: Cross multiply
    118,137.90x = 177,072.75 × 103,878.78
  4. Step 4: Simplify right side
    118,137.90x = 18,394,101,515.72
  5. Step 5: Solve for x
    x = 18,394,101,515.72/118,137.90
  6. Step 6: Final answer
    x = 155,700.25

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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.