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Finding the Fourth Proportional to 403,603, 605,405.25 and 378,940.81

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Solution

The fourth proportional to 403,603, 605,405.25 and 378,940.81 is: 568,411.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,603 : 605,405.25 = 378,940.81 : x
  2. Step 2: Convert to fraction form
    403,603/605,405.25 = 378,940.81/x
  3. Step 3: Cross multiply
    403,603x = 605,405.25 × 378,940.81
  4. Step 4: Simplify right side
    403,603x = 229,412,755,813.25
  5. Step 5: Solve for x
    x = 229,412,755,813.25/403,603
  6. Step 6: Final answer
    x = 568,411.92

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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.