Home / 128,086.20-192,129.30-81,372.60

Finding the Fourth Proportional to 128,086.20, 192,129.30 and 81,372.60

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Solution

The fourth proportional to 128,086.20, 192,129.30 and 81,372.60 is: 122,058.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,086.20 : 192,129.30 = 81,372.60 : x
  2. Step 2: Convert to fraction form
    128,086.20/192,129.30 = 81,372.60/x
  3. Step 3: Cross multiply
    128,086.20x = 192,129.30 × 81,372.60
  4. Step 4: Simplify right side
    128,086.20x = 15,634,060,677.18
  5. Step 5: Solve for x
    x = 15,634,060,677.18/128,086.20
  6. Step 6: Final answer
    x = 122,058.90

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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.