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Finding the Fourth Proportional to 259,480.80, 389,221.20 and 69,940.80

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Solution

The fourth proportional to 259,480.80, 389,221.20 and 69,940.80 is: 104,911.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,480.80 : 389,221.20 = 69,940.80 : x
  2. Step 2: Convert to fraction form
    259,480.80/389,221.20 = 69,940.80/x
  3. Step 3: Cross multiply
    259,480.80x = 389,221.20 × 69,940.80
  4. Step 4: Simplify right side
    259,480.80x = 27,222,442,104.96
  5. Step 5: Solve for x
    x = 27,222,442,104.96/259,480.80
  6. Step 6: Final answer
    x = 104,911.20

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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.