Home / 128,083.20-191,906.10-81,281.40

Finding the Fourth Proportional to 128,083.20, 191,906.10 and 81,281.40

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Solution

The fourth proportional to 128,083.20, 191,906.10 and 81,281.40 is: 121,783.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,083.20 : 191,906.10 = 81,281.40 : x
  2. Step 2: Convert to fraction form
    128,083.20/191,906.10 = 81,281.40/x
  3. Step 3: Cross multiply
    128,083.20x = 191,906.10 × 81,281.40
  4. Step 4: Simplify right side
    128,083.20x = 15,598,396,476.54
  5. Step 5: Solve for x
    x = 15,598,396,476.54/128,083.20
  6. Step 6: Final answer
    x = 121,783.31

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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.