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Finding the Fourth Proportional to 103,629.20, 155,443.80 and 81,078.80

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Solution

The fourth proportional to 103,629.20, 155,443.80 and 81,078.80 is: 121,618.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,629.20 : 155,443.80 = 81,078.80 : x
  2. Step 2: Convert to fraction form
    103,629.20/155,443.80 = 81,078.80/x
  3. Step 3: Cross multiply
    103,629.20x = 155,443.80 × 81,078.80
  4. Step 4: Simplify right side
    103,629.20x = 12,603,196,771.44
  5. Step 5: Solve for x
    x = 12,603,196,771.44/103,629.20
  6. Step 6: Final answer
    x = 121,618.20

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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.