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Finding the Fourth Proportional to 419,986.40, 629,979.60 and 380,620.40

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Solution

The fourth proportional to 419,986.40, 629,979.60 and 380,620.40 is: 570,930.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,986.40 : 629,979.60 = 380,620.40 : x
  2. Step 2: Convert to fraction form
    419,986.40/629,979.60 = 380,620.40/x
  3. Step 3: Cross multiply
    419,986.40x = 629,979.60 × 380,620.40
  4. Step 4: Simplify right side
    419,986.40x = 239,783,087,343.84
  5. Step 5: Solve for x
    x = 239,783,087,343.84/419,986.40
  6. Step 6: Final answer
    x = 570,930.60

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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.