Home / 80,035.60-120,128.73-40,621

Finding the Fourth Proportional to 80,035.60, 120,128.73 and 40,621

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Solution

The fourth proportional to 80,035.60, 120,128.73 and 40,621 is: 60,969.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,035.60 : 120,128.73 = 40,621 : x
  2. Step 2: Convert to fraction form
    80,035.60/120,128.73 = 40,621/x
  3. Step 3: Cross multiply
    80,035.60x = 120,128.73 × 40,621
  4. Step 4: Simplify right side
    80,035.60x = 4,879,749,141.33
  5. Step 5: Solve for x
    x = 4,879,749,141.33/80,035.60
  6. Step 6: Final answer
    x = 60,969.73

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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.