Home / 81,156.06-121,741-21,192.48

Finding the Fourth Proportional to 81,156.06, 121,741 and 21,192.48

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Solution

The fourth proportional to 81,156.06, 121,741 and 21,192.48 is: 31,790.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,156.06 : 121,741 = 21,192.48 : x
  2. Step 2: Convert to fraction form
    81,156.06/121,741 = 21,192.48/x
  3. Step 3: Cross multiply
    81,156.06x = 121,741 × 21,192.48
  4. Step 4: Simplify right side
    81,156.06x = 2,579,993,707.68
  5. Step 5: Solve for x
    x = 2,579,993,707.68/81,156.06
  6. Step 6: Final answer
    x = 31,790.52

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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.