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Finding the Fourth Proportional to 258,436.60, 387,684.78 and 68,899.48

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Solution

The fourth proportional to 258,436.60, 387,684.78 and 68,899.48 is: 103,357.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,436.60 : 387,684.78 = 68,899.48 : x
  2. Step 2: Convert to fraction form
    258,436.60/387,684.78 = 68,899.48/x
  3. Step 3: Cross multiply
    258,436.60x = 387,684.78 × 68,899.48
  4. Step 4: Simplify right side
    258,436.60x = 26,711,279,745.91
  5. Step 5: Solve for x
    x = 26,711,279,745.91/258,436.60
  6. Step 6: Final answer
    x = 103,357.19

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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.