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Finding the Fourth Proportional to 121,919.25, 182,712.83 and 68,636.64

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Solution

The fourth proportional to 121,919.25, 182,712.83 and 68,636.64 is: 102,861.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,919.25 : 182,712.83 = 68,636.64 : x
  2. Step 2: Convert to fraction form
    121,919.25/182,712.83 = 68,636.64/x
  3. Step 3: Cross multiply
    121,919.25x = 182,712.83 × 68,636.64
  4. Step 4: Simplify right side
    121,919.25x = 12,540,794,392.91
  5. Step 5: Solve for x
    x = 12,540,794,392.91/121,919.25
  6. Step 6: Final answer
    x = 102,861.48

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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.