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Finding the Fourth Proportional to 258,415.91, 387,623.87 and 80,936.81

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Solution

The fourth proportional to 258,415.91, 387,623.87 and 80,936.81 is: 121,405.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,415.91 : 387,623.87 = 80,936.81 : x
  2. Step 2: Convert to fraction form
    258,415.91/387,623.87 = 80,936.81/x
  3. Step 3: Cross multiply
    258,415.91x = 387,623.87 × 80,936.81
  4. Step 4: Simplify right side
    258,415.91x = 31,373,039,517.65
  5. Step 5: Solve for x
    x = 31,373,039,517.65/258,415.91
  6. Step 6: Final answer
    x = 121,405.22

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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.