Home / 81,161.10-121,745.30-31,223.43

Finding the Fourth Proportional to 81,161.10, 121,745.30 and 31,223.43

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Solution

The fourth proportional to 81,161.10, 121,745.30 and 31,223.43 is: 46,836.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,161.10 : 121,745.30 = 31,223.43 : x
  2. Step 2: Convert to fraction form
    81,161.10/121,745.30 = 31,223.43/x
  3. Step 3: Cross multiply
    81,161.10x = 121,745.30 × 31,223.43
  4. Step 4: Simplify right side
    81,161.10x = 3,801,305,696.26
  5. Step 5: Solve for x
    x = 3,801,305,696.26/81,161.10
  6. Step 6: Final answer
    x = 46,836.55

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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.