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Finding the Fourth Proportional to 324,680.80, 487,021.20 and 289,429.60

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Solution

The fourth proportional to 324,680.80, 487,021.20 and 289,429.60 is: 434,144.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    324,680.80 : 487,021.20 = 289,429.60 : x
  2. Step 2: Convert to fraction form
    324,680.80/487,021.20 = 289,429.60/x
  3. Step 3: Cross multiply
    324,680.80x = 487,021.20 × 289,429.60
  4. Step 4: Simplify right side
    324,680.80x = 140,958,351,107.52
  5. Step 5: Solve for x
    x = 140,958,351,107.52/324,680.80
  6. Step 6: Final answer
    x = 434,144.40

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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.