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Finding the Fourth Proportional to 258,425.68, 387,640.14 and 80,919.04

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Solution

The fourth proportional to 258,425.68, 387,640.14 and 80,919.04 is: 121,379.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,425.68 : 387,640.14 = 80,919.04 : x
  2. Step 2: Convert to fraction form
    258,425.68/387,640.14 = 80,919.04/x
  3. Step 3: Cross multiply
    258,425.68x = 387,640.14 × 80,919.04
  4. Step 4: Simplify right side
    258,425.68x = 31,367,467,994.27
  5. Step 5: Solve for x
    x = 31,367,467,994.27/258,425.68
  6. Step 6: Final answer
    x = 121,379.07

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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.