Home / 258,723.78-388,087.38-90,243.48

Finding the Fourth Proportional to 258,723.78, 388,087.38 and 90,243.48

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Solution

The fourth proportional to 258,723.78, 388,087.38 and 90,243.48 is: 135,365.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,723.78 : 388,087.38 = 90,243.48 : x
  2. Step 2: Convert to fraction form
    258,723.78/388,087.38 = 90,243.48/x
  3. Step 3: Cross multiply
    258,723.78x = 388,087.38 × 90,243.48
  4. Step 4: Simplify right side
    258,723.78x = 35,022,355,715.28
  5. Step 5: Solve for x
    x = 35,022,355,715.28/258,723.78
  6. Step 6: Final answer
    x = 135,365.82

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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.