Home / 820,724.80-1,228,286.40-687,755.20

Finding the Fourth Proportional to 820,724.80, 1,228,286.40 and 687,755.20

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Solution

The fourth proportional to 820,724.80, 1,228,286.40 and 687,755.20 is: 1,029,285.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,724.80 : 1,228,286.40 = 687,755.20 : x
  2. Step 2: Convert to fraction form
    820,724.80/1,228,286.40 = 687,755.20/x
  3. Step 3: Cross multiply
    820,724.80x = 1,228,286.40 × 687,755.20
  4. Step 4: Simplify right side
    820,724.80x = 844,760,358,689.28
  5. Step 5: Solve for x
    x = 844,760,358,689.28/820,724.80
  6. Step 6: Final answer
    x = 1,029,285.77

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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.