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Finding the Fourth Proportional to 620,405.67, 855,941.81 and 405,671.43

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Solution

The fourth proportional to 620,405.67, 855,941.81 and 405,671.43 is: 559,684.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,405.67 : 855,941.81 = 405,671.43 : x
  2. Step 2: Convert to fraction form
    620,405.67/855,941.81 = 405,671.43/x
  3. Step 3: Cross multiply
    620,405.67x = 855,941.81 × 405,671.43
  4. Step 4: Simplify right side
    620,405.67x = 347,231,136,031.13
  5. Step 5: Solve for x
    x = 347,231,136,031.13/620,405.67
  6. Step 6: Final answer
    x = 559,684.01

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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.