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Finding the Fourth Proportional to 258,415.66, 387,623.49 and 80,936.56

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Solution

The fourth proportional to 258,415.66, 387,623.49 and 80,936.56 is: 121,404.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,415.66 : 387,623.49 = 80,936.56 : x
  2. Step 2: Convert to fraction form
    258,415.66/387,623.49 = 80,936.56/x
  3. Step 3: Cross multiply
    258,415.66x = 387,623.49 × 80,936.56
  4. Step 4: Simplify right side
    258,415.66x = 31,372,911,855.79
  5. Step 5: Solve for x
    x = 31,372,911,855.79/258,415.66
  6. Step 6: Final answer
    x = 121,404.84

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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.