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Finding the Fourth Proportional to 81,721.60, 122,608.80 and 40,139.44

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Solution

The fourth proportional to 81,721.60, 122,608.80 and 40,139.44 is: 60,222.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,721.60 : 122,608.80 = 40,139.44 : x
  2. Step 2: Convert to fraction form
    81,721.60/122,608.80 = 40,139.44/x
  3. Step 3: Cross multiply
    81,721.60x = 122,608.80 × 40,139.44
  4. Step 4: Simplify right side
    81,721.60x = 4,921,448,571.07
  5. Step 5: Solve for x
    x = 4,921,448,571.07/81,721.60
  6. Step 6: Final answer
    x = 60,222.13

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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.