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Finding the Fourth Proportional to 439,405.20, 659,107.80 and 431,629.20

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Solution

The fourth proportional to 439,405.20, 659,107.80 and 431,629.20 is: 647,443.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,405.20 : 659,107.80 = 431,629.20 : x
  2. Step 2: Convert to fraction form
    439,405.20/659,107.80 = 431,629.20/x
  3. Step 3: Cross multiply
    439,405.20x = 659,107.80 × 431,629.20
  4. Step 4: Simplify right side
    439,405.20x = 284,490,172,427.76
  5. Step 5: Solve for x
    x = 284,490,172,427.76/439,405.20
  6. Step 6: Final answer
    x = 647,443.80

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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.