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Finding the Fourth Proportional to 144,390.90, 199,260 and 80,728.55

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Solution

The fourth proportional to 144,390.90, 199,260 and 80,728.55 is: 111,405.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    144,390.90 : 199,260 = 80,728.55 : x
  2. Step 2: Convert to fraction form
    144,390.90/199,260 = 80,728.55/x
  3. Step 3: Cross multiply
    144,390.90x = 199,260 × 80,728.55
  4. Step 4: Simplify right side
    144,390.90x = 16,085,970,623.93
  5. Step 5: Solve for x
    x = 16,085,970,623.93/144,390.90
  6. Step 6: Final answer
    x = 111,405.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.