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Finding the Fourth Proportional to 258,152.80, 387,229.20 and 68,612.80

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Solution

The fourth proportional to 258,152.80, 387,229.20 and 68,612.80 is: 102,919.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,152.80 : 387,229.20 = 68,612.80 : x
  2. Step 2: Convert to fraction form
    258,152.80/387,229.20 = 68,612.80/x
  3. Step 3: Cross multiply
    258,152.80x = 387,229.20 × 68,612.80
  4. Step 4: Simplify right side
    258,152.80x = 26,568,879,653.76
  5. Step 5: Solve for x
    x = 26,568,879,653.76/258,152.80
  6. Step 6: Final answer
    x = 102,919.20

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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.