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Finding the Fourth Proportional to 419,945.40, 629,918.10 and 251,983.80

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Solution

The fourth proportional to 419,945.40, 629,918.10 and 251,983.80 is: 377,975.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,945.40 : 629,918.10 = 251,983.80 : x
  2. Step 2: Convert to fraction form
    419,945.40/629,918.10 = 251,983.80/x
  3. Step 3: Cross multiply
    419,945.40x = 629,918.10 × 251,983.80
  4. Step 4: Simplify right side
    419,945.40x = 158,729,156,526.78
  5. Step 5: Solve for x
    x = 158,729,156,526.78/419,945.40
  6. Step 6: Final answer
    x = 377,975.70

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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.