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Finding the Fourth Proportional to 391,336.20, 587,393.10 and 191,881.80

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Solution

The fourth proportional to 391,336.20, 587,393.10 and 191,881.80 is: 288,013.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,336.20 : 587,393.10 = 191,881.80 : x
  2. Step 2: Convert to fraction form
    391,336.20/587,393.10 = 191,881.80/x
  3. Step 3: Cross multiply
    391,336.20x = 587,393.10 × 191,881.80
  4. Step 4: Simplify right side
    391,336.20x = 112,710,045,335.58
  5. Step 5: Solve for x
    x = 112,710,045,335.58/391,336.20
  6. Step 6: Final answer
    x = 288,013.34

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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.