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Finding the Fourth Proportional to 128,540.70, 192,730.05 and 53,712.90

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Solution

The fourth proportional to 128,540.70, 192,730.05 and 53,712.90 is: 80,535.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,540.70 : 192,730.05 = 53,712.90 : x
  2. Step 2: Convert to fraction form
    128,540.70/192,730.05 = 53,712.90/x
  3. Step 3: Cross multiply
    128,540.70x = 192,730.05 × 53,712.90
  4. Step 4: Simplify right side
    128,540.70x = 10,352,089,902.65
  5. Step 5: Solve for x
    x = 10,352,089,902.65/128,540.70
  6. Step 6: Final answer
    x = 80,535.50

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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.