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Finding the Fourth Proportional to 643,859.20, 965,788.80 and 511,148.80

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Solution

The fourth proportional to 643,859.20, 965,788.80 and 511,148.80 is: 766,723.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,859.20 : 965,788.80 = 511,148.80 : x
  2. Step 2: Convert to fraction form
    643,859.20/965,788.80 = 511,148.80/x
  3. Step 3: Cross multiply
    643,859.20x = 965,788.80 × 511,148.80
  4. Step 4: Simplify right side
    643,859.20x = 493,661,786,173.44
  5. Step 5: Solve for x
    x = 493,661,786,173.44/643,859.20
  6. Step 6: Final answer
    x = 766,723.20

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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.