Home / 678,355.37-936,145.14-387,993.75

Finding the Fourth Proportional to 678,355.37, 936,145.14 and 387,993.75

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Solution

The fourth proportional to 678,355.37, 936,145.14 and 387,993.75 is: 535,439.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,355.37 : 936,145.14 = 387,993.75 : x
  2. Step 2: Convert to fraction form
    678,355.37/936,145.14 = 387,993.75/x
  3. Step 3: Cross multiply
    678,355.37x = 936,145.14 × 387,993.75
  4. Step 4: Simplify right side
    678,355.37x = 363,218,463,412.88
  5. Step 5: Solve for x
    x = 363,218,463,412.88/678,355.37
  6. Step 6: Final answer
    x = 535,439.80

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.