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Finding the Fourth Proportional to 839,959.80, 1,261,251.90 and 485,665.80

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Solution

The fourth proportional to 839,959.80, 1,261,251.90 and 485,665.80 is: 729,257.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    839,959.80 : 1,261,251.90 = 485,665.80 : x
  2. Step 2: Convert to fraction form
    839,959.80/1,261,251.90 = 485,665.80/x
  3. Step 3: Cross multiply
    839,959.80x = 1,261,251.90 × 485,665.80
  4. Step 4: Simplify right side
    839,959.80x = 612,546,913,015.02
  5. Step 5: Solve for x
    x = 612,546,913,015.02/839,959.80
  6. Step 6: Final answer
    x = 729,257.42

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1.5x scale

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.