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Finding the Fourth Proportional to 393,640.69, 590,554.73 and 127,401.21

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Solution

The fourth proportional to 393,640.69, 590,554.73 and 127,401.21 is: 191,132.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,640.69 : 590,554.73 = 127,401.21 : x
  2. Step 2: Convert to fraction form
    393,640.69/590,554.73 = 127,401.21/x
  3. Step 3: Cross multiply
    393,640.69x = 590,554.73 × 127,401.21
  4. Step 4: Simplify right side
    393,640.69x = 75,237,387,173.22
  5. Step 5: Solve for x
    x = 75,237,387,173.22/393,640.69
  6. Step 6: Final answer
    x = 191,132.14

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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.