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Finding the Fourth Proportional to 391,776.12, 587,664.18 and 111,256.92

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Solution

The fourth proportional to 391,776.12, 587,664.18 and 111,256.92 is: 166,885.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,776.12 : 587,664.18 = 111,256.92 : x
  2. Step 2: Convert to fraction form
    391,776.12/587,664.18 = 111,256.92/x
  3. Step 3: Cross multiply
    391,776.12x = 587,664.18 × 111,256.92
  4. Step 4: Simplify right side
    391,776.12x = 65,381,706,661.13
  5. Step 5: Solve for x
    x = 65,381,706,661.13/391,776.12
  6. Step 6: Final answer
    x = 166,885.38

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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.