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Finding the Fourth Proportional to 439,911.78, 607,078.20 and 238,707.78

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Solution

The fourth proportional to 439,911.78, 607,078.20 and 238,707.78 is: 329,416.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,911.78 : 607,078.20 = 238,707.78 : x
  2. Step 2: Convert to fraction form
    439,911.78/607,078.20 = 238,707.78/x
  3. Step 3: Cross multiply
    439,911.78x = 607,078.20 × 238,707.78
  4. Step 4: Simplify right side
    439,911.78x = 144,914,289,408.40
  5. Step 5: Solve for x
    x = 144,914,289,408.40/439,911.78
  6. Step 6: Final answer
    x = 329,416.71

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1.5x scale

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.