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Finding the Fourth Proportional to 620,408.17, 855,945.24 and 405,673.93

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Solution

The fourth proportional to 620,408.17, 855,945.24 and 405,673.93 is: 559,687.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,408.17 : 855,945.24 = 405,673.93 : x
  2. Step 2: Convert to fraction form
    620,408.17/855,945.24 = 405,673.93/x
  3. Step 3: Cross multiply
    620,408.17x = 855,945.24 × 405,673.93
  4. Step 4: Simplify right side
    620,408.17x = 347,234,669,375.59
  5. Step 5: Solve for x
    x = 347,234,669,375.59/620,408.17
  6. Step 6: Final answer
    x = 559,687.45

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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.