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Finding the Fourth Proportional to 258,750.72, 388,003.28 and 90,250.57

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Solution

The fourth proportional to 258,750.72, 388,003.28 and 90,250.57 is: 135,333.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,750.72 : 388,003.28 = 90,250.57 : x
  2. Step 2: Convert to fraction form
    258,750.72/388,003.28 = 90,250.57/x
  3. Step 3: Cross multiply
    258,750.72x = 388,003.28 × 90,250.57
  4. Step 4: Simplify right side
    258,750.72x = 35,017,517,215.62
  5. Step 5: Solve for x
    x = 35,017,517,215.62/258,750.72
  6. Step 6: Final answer
    x = 135,333.02

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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.