Home / 128,512.15-192,822.90-81,163.60

Finding the Fourth Proportional to 128,512.15, 192,822.90 and 81,163.60

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Solution

The fourth proportional to 128,512.15, 192,822.90 and 81,163.60 is: 121,779.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,512.15 : 192,822.90 = 81,163.60 : x
  2. Step 2: Convert to fraction form
    128,512.15/192,822.90 = 81,163.60/x
  3. Step 3: Cross multiply
    128,512.15x = 192,822.90 × 81,163.60
  4. Step 4: Simplify right side
    128,512.15x = 15,650,200,726.44
  5. Step 5: Solve for x
    x = 15,650,200,726.44/128,512.15
  6. Step 6: Final answer
    x = 121,779.93

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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.