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Finding the Fourth Proportional to 439,540.80, 659,311.20 and 321,442.80

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Solution

The fourth proportional to 439,540.80, 659,311.20 and 321,442.80 is: 482,164.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,540.80 : 659,311.20 = 321,442.80 : x
  2. Step 2: Convert to fraction form
    439,540.80/659,311.20 = 321,442.80/x
  3. Step 3: Cross multiply
    439,540.80x = 659,311.20 × 321,442.80
  4. Step 4: Simplify right side
    439,540.80x = 211,930,838,199.36
  5. Step 5: Solve for x
    x = 211,930,838,199.36/439,540.80
  6. Step 6: Final answer
    x = 482,164.20

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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.