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Finding the Fourth Proportional to 258,115, 387,187.08 and 91,903

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Solution

The fourth proportional to 258,115, 387,187.08 and 91,903 is: 137,859.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,115 : 387,187.08 = 91,903 : x
  2. Step 2: Convert to fraction form
    258,115/387,187.08 = 91,903/x
  3. Step 3: Cross multiply
    258,115x = 387,187.08 × 91,903
  4. Step 4: Simplify right side
    258,115x = 35,583,654,213.24
  5. Step 5: Solve for x
    x = 35,583,654,213.24/258,115
  6. Step 6: Final answer
    x = 137,859.69

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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.