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Finding the Fourth Proportional to 389,661.43, 584,525.29 and 136,920.09

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Solution

The fourth proportional to 389,661.43, 584,525.29 and 136,920.09 is: 205,391.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,661.43 : 584,525.29 = 136,920.09 : x
  2. Step 2: Convert to fraction form
    389,661.43/584,525.29 = 136,920.09/x
  3. Step 3: Cross multiply
    389,661.43x = 584,525.29 × 136,920.09
  4. Step 4: Simplify right side
    389,661.43x = 80,033,253,747.43
  5. Step 5: Solve for x
    x = 80,033,253,747.43/389,661.43
  6. Step 6: Final answer
    x = 205,391.78

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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.