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Finding the Fourth Proportional to 543,419.40, 815,129.10 and 419,003.40

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Solution

The fourth proportional to 543,419.40, 815,129.10 and 419,003.40 is: 628,505.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,419.40 : 815,129.10 = 419,003.40 : x
  2. Step 2: Convert to fraction form
    543,419.40/815,129.10 = 419,003.40/x
  3. Step 3: Cross multiply
    543,419.40x = 815,129.10 × 419,003.40
  4. Step 4: Simplify right side
    543,419.40x = 341,541,864,338.94
  5. Step 5: Solve for x
    x = 341,541,864,338.94/543,419.40
  6. Step 6: Final answer
    x = 628,505.10

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Similar ratio
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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.