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Finding the Fourth Proportional to 405,636.83, 608,554.87 and 139,401.17

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Solution

The fourth proportional to 405,636.83, 608,554.87 and 139,401.17 is: 209,135.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,636.83 : 608,554.87 = 139,401.17 : x
  2. Step 2: Convert to fraction form
    405,636.83/608,554.87 = 139,401.17/x
  3. Step 3: Cross multiply
    405,636.83x = 608,554.87 × 139,401.17
  4. Step 4: Simplify right side
    405,636.83x = 84,833,257,495.92
  5. Step 5: Solve for x
    x = 84,833,257,495.92/405,636.83
  6. Step 6: Final answer
    x = 209,135.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.