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Finding the Fourth Proportional to 138,571.48, 207,645.75 and 72,033.22

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Solution

The fourth proportional to 138,571.48, 207,645.75 and 72,033.22 is: 107,939.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,571.48 : 207,645.75 = 72,033.22 : x
  2. Step 2: Convert to fraction form
    138,571.48/207,645.75 = 72,033.22/x
  3. Step 3: Cross multiply
    138,571.48x = 207,645.75 × 72,033.22
  4. Step 4: Simplify right side
    138,571.48x = 14,957,391,991.82
  5. Step 5: Solve for x
    x = 14,957,391,991.82/138,571.48
  6. Step 6: Final answer
    x = 107,939.90

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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.