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Finding the Fourth Proportional to 715,676.78, 987,622.57 and 393,379.94

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Solution

The fourth proportional to 715,676.78, 987,622.57 and 393,379.94 is: 542,858.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,676.78 : 987,622.57 = 393,379.94 : x
  2. Step 2: Convert to fraction form
    715,676.78/987,622.57 = 393,379.94/x
  3. Step 3: Cross multiply
    715,676.78x = 987,622.57 × 393,379.94
  4. Step 4: Simplify right side
    715,676.78x = 388,510,907,329.25
  5. Step 5: Solve for x
    x = 388,510,907,329.25/715,676.78
  6. Step 6: Final answer
    x = 542,858.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.