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Finding the Fourth Proportional to 620,396.92, 855,929.72 and 405,662.68

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Solution

The fourth proportional to 620,396.92, 855,929.72 and 405,662.68 is: 559,671.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,396.92 : 855,929.72 = 405,662.68 : x
  2. Step 2: Convert to fraction form
    620,396.92/855,929.72 = 405,662.68/x
  3. Step 3: Cross multiply
    620,396.92x = 855,929.72 × 405,662.68
  4. Step 4: Simplify right side
    620,396.92x = 347,218,744,106.85
  5. Step 5: Solve for x
    x = 347,218,744,106.85/620,396.92
  6. Step 6: Final answer
    x = 559,671.93

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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.