Home / 809,331.80-1,213,997.70-388,506.20

Finding the Fourth Proportional to 809,331.80, 1,213,997.70 and 388,506.20

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Solution

The fourth proportional to 809,331.80, 1,213,997.70 and 388,506.20 is: 582,759.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    809,331.80 : 1,213,997.70 = 388,506.20 : x
  2. Step 2: Convert to fraction form
    809,331.80/1,213,997.70 = 388,506.20/x
  3. Step 3: Cross multiply
    809,331.80x = 1,213,997.70 × 388,506.20
  4. Step 4: Simplify right side
    809,331.80x = 471,645,633,235.74
  5. Step 5: Solve for x
    x = 471,645,633,235.74/809,331.80
  6. Step 6: Final answer
    x = 582,759.30

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Double scale
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Similar ratio
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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.