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Finding the Fourth Proportional to 122,129.20, 183,339.60 and 68,863.60

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Solution

The fourth proportional to 122,129.20, 183,339.60 and 68,863.60 is: 103,377.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,129.20 : 183,339.60 = 68,863.60 : x
  2. Step 2: Convert to fraction form
    122,129.20/183,339.60 = 68,863.60/x
  3. Step 3: Cross multiply
    122,129.20x = 183,339.60 × 68,863.60
  4. Step 4: Simplify right side
    122,129.20x = 12,625,424,878.56
  5. Step 5: Solve for x
    x = 12,625,424,878.56/122,129.20
  6. Step 6: Final answer
    x = 103,377.61

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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.