Home / 81,321.40-121,982.10-25,917.40

Finding the Fourth Proportional to 81,321.40, 121,982.10 and 25,917.40

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Solution

The fourth proportional to 81,321.40, 121,982.10 and 25,917.40 is: 38,876.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,321.40 : 121,982.10 = 25,917.40 : x
  2. Step 2: Convert to fraction form
    81,321.40/121,982.10 = 25,917.40/x
  3. Step 3: Cross multiply
    81,321.40x = 121,982.10 × 25,917.40
  4. Step 4: Simplify right side
    81,321.40x = 3,161,458,878.54
  5. Step 5: Solve for x
    x = 3,161,458,878.54/81,321.40
  6. Step 6: Final answer
    x = 38,876.10

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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.