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Finding the Fourth Proportional to 258,611.56, 387,917.80 and 81,132.56

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Solution

The fourth proportional to 258,611.56, 387,917.80 and 81,132.56 is: 121,698.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,611.56 : 387,917.80 = 81,132.56 : x
  2. Step 2: Convert to fraction form
    258,611.56/387,917.80 = 81,132.56/x
  3. Step 3: Cross multiply
    258,611.56x = 387,917.80 × 81,132.56
  4. Step 4: Simplify right side
    258,611.56x = 31,472,764,183.57
  5. Step 5: Solve for x
    x = 31,472,764,183.57/258,611.56
  6. Step 6: Final answer
    x = 121,698.98

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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.