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Finding the Fourth Proportional to 259,405.75, 389,120.57 and 79,478.29

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Solution

The fourth proportional to 259,405.75, 389,120.57 and 79,478.29 is: 119,221.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,405.75 : 389,120.57 = 79,478.29 : x
  2. Step 2: Convert to fraction form
    259,405.75/389,120.57 = 79,478.29/x
  3. Step 3: Cross multiply
    259,405.75x = 389,120.57 × 79,478.29
  4. Step 4: Simplify right side
    259,405.75x = 30,926,637,507.43
  5. Step 5: Solve for x
    x = 30,926,637,507.43/259,405.75
  6. Step 6: Final answer
    x = 119,221.09

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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.