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Finding the Fourth Proportional to 258,833.75, 388,344.05 and 90,378.90

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Solution

The fourth proportional to 258,833.75, 388,344.05 and 90,378.90 is: 135,600.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,833.75 : 388,344.05 = 90,378.90 : x
  2. Step 2: Convert to fraction form
    258,833.75/388,344.05 = 90,378.90/x
  3. Step 3: Cross multiply
    258,833.75x = 388,344.05 × 90,378.90
  4. Step 4: Simplify right side
    258,833.75x = 35,098,107,608.65
  5. Step 5: Solve for x
    x = 35,098,107,608.65/258,833.75
  6. Step 6: Final answer
    x = 135,600.97

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1.5x scale

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.