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Finding the Fourth Proportional to 258,135, 387,217.08 and 91,923

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Solution

The fourth proportional to 258,135, 387,217.08 and 91,923 is: 137,889.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,135 : 387,217.08 = 91,923 : x
  2. Step 2: Convert to fraction form
    258,135/387,217.08 = 91,923/x
  3. Step 3: Cross multiply
    258,135x = 387,217.08 × 91,923
  4. Step 4: Simplify right side
    258,135x = 35,594,155,644.84
  5. Step 5: Solve for x
    x = 35,594,155,644.84/258,135
  6. Step 6: Final answer
    x = 137,889.69

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.