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Finding the Fourth Proportional to 820,713.80, 1,228,269.90 and 687,744.20

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Solution

The fourth proportional to 820,713.80, 1,228,269.90 and 687,744.20 is: 1,029,269.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,713.80 : 1,228,269.90 = 687,744.20 : x
  2. Step 2: Convert to fraction form
    820,713.80/1,228,269.90 = 687,744.20/x
  3. Step 3: Cross multiply
    820,713.80x = 1,228,269.90 × 687,744.20
  4. Step 4: Simplify right side
    820,713.80x = 844,735,499,759.58
  5. Step 5: Solve for x
    x = 844,735,499,759.58/820,713.80
  6. Step 6: Final answer
    x = 1,029,269.28

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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.