Home / 820,816.60-1,231,109.70-259,907.80

Finding the Fourth Proportional to 820,816.60, 1,231,109.70 and 259,907.80

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Solution

The fourth proportional to 820,816.60, 1,231,109.70 and 259,907.80 is: 389,825.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,816.60 : 1,231,109.70 = 259,907.80 : x
  2. Step 2: Convert to fraction form
    820,816.60/1,231,109.70 = 259,907.80/x
  3. Step 3: Cross multiply
    820,816.60x = 1,231,109.70 × 259,907.80
  4. Step 4: Simplify right side
    820,816.60x = 319,975,013,685.66
  5. Step 5: Solve for x
    x = 319,975,013,685.66/820,816.60
  6. Step 6: Final answer
    x = 389,825.22

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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.