Home / 128,053.20-191,861.10-81,251.40

Finding the Fourth Proportional to 128,053.20, 191,861.10 and 81,251.40

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Solution

The fourth proportional to 128,053.20, 191,861.10 and 81,251.40 is: 121,738.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,053.20 : 191,861.10 = 81,251.40 : x
  2. Step 2: Convert to fraction form
    128,053.20/191,861.10 = 81,251.40/x
  3. Step 3: Cross multiply
    128,053.20x = 191,861.10 × 81,251.40
  4. Step 4: Simplify right side
    128,053.20x = 15,588,982,980.54
  5. Step 5: Solve for x
    x = 15,588,982,980.54/128,053.20
  6. Step 6: Final answer
    x = 121,738.33

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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.