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Finding the Fourth Proportional to 620,404.67, 855,940.42 and 405,670.43

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Solution

The fourth proportional to 620,404.67, 855,940.42 and 405,670.43 is: 559,682.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,404.67 : 855,940.42 = 405,670.43 : x
  2. Step 2: Convert to fraction form
    620,404.67/855,940.42 = 405,670.43/x
  3. Step 3: Cross multiply
    620,404.67x = 855,940.42 × 405,670.43
  4. Step 4: Simplify right side
    620,404.67x = 347,229,718,235.78
  5. Step 5: Solve for x
    x = 347,229,718,235.78/620,404.67
  6. Step 6: Final answer
    x = 559,682.63

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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.