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Finding the Fourth Proportional to 620,821.72, 855,916.86 and 405,587.80

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Solution

The fourth proportional to 620,821.72, 855,916.86 and 405,587.80 is: 559,177.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,821.72 : 855,916.86 = 405,587.80 : x
  2. Step 2: Convert to fraction form
    620,821.72/855,916.86 = 405,587.80/x
  3. Step 3: Cross multiply
    620,821.72x = 855,916.86 × 405,587.80
  4. Step 4: Simplify right side
    620,821.72x = 347,149,436,230.31
  5. Step 5: Solve for x
    x = 347,149,436,230.31/620,821.72
  6. Step 6: Final answer
    x = 559,177.34

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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.