Home / 81,321.30-121,921.70-38,605.59

Finding the Fourth Proportional to 81,321.30, 121,921.70 and 38,605.59

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Solution

The fourth proportional to 81,321.30, 121,921.70 and 38,605.59 is: 57,879.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,321.30 : 121,921.70 = 38,605.59 : x
  2. Step 2: Convert to fraction form
    81,321.30/121,921.70 = 38,605.59/x
  3. Step 3: Cross multiply
    81,321.30x = 121,921.70 × 38,605.59
  4. Step 4: Simplify right side
    81,321.30x = 4,706,858,969.28
  5. Step 5: Solve for x
    x = 4,706,858,969.28/81,321.30
  6. Step 6: Final answer
    x = 57,879.78

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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.