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Finding the Fourth Proportional to 543,906.90, 815,860.35 and 419,490.90

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Solution

The fourth proportional to 543,906.90, 815,860.35 and 419,490.90 is: 629,236.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,906.90 : 815,860.35 = 419,490.90 : x
  2. Step 2: Convert to fraction form
    543,906.90/815,860.35 = 419,490.90/x
  3. Step 3: Cross multiply
    543,906.90x = 815,860.35 × 419,490.90
  4. Step 4: Simplify right side
    543,906.90x = 342,245,992,495.82
  5. Step 5: Solve for x
    x = 342,245,992,495.82/543,906.90
  6. Step 6: Final answer
    x = 629,236.35

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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.