Home / 389,619.80-584,429.70-319,578.20

Finding the Fourth Proportional to 389,619.80, 584,429.70 and 319,578.20

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Solution

The fourth proportional to 389,619.80, 584,429.70 and 319,578.20 is: 479,367.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,619.80 : 584,429.70 = 319,578.20 : x
  2. Step 2: Convert to fraction form
    389,619.80/584,429.70 = 319,578.20/x
  3. Step 3: Cross multiply
    389,619.80x = 584,429.70 × 319,578.20
  4. Step 4: Simplify right side
    389,619.80x = 186,770,991,552.54
  5. Step 5: Solve for x
    x = 186,770,991,552.54/389,619.80
  6. Step 6: Final answer
    x = 479,367.30

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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.