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Finding the Fourth Proportional to 640,802.20, 959,891.10 and 325,436.80

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Solution

The fourth proportional to 640,802.20, 959,891.10 and 325,436.80 is: 487,488.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,802.20 : 959,891.10 = 325,436.80 : x
  2. Step 2: Convert to fraction form
    640,802.20/959,891.10 = 325,436.80/x
  3. Step 3: Cross multiply
    640,802.20x = 959,891.10 × 325,436.80
  4. Step 4: Simplify right side
    640,802.20x = 312,383,887,932.48
  5. Step 5: Solve for x
    x = 312,383,887,932.48/640,802.20
  6. Step 6: Final answer
    x = 487,488.79

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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.