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Finding the Fourth Proportional to 391,317.30, 587,085.30 and 191,644.20

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Solution

The fourth proportional to 391,317.30, 587,085.30 and 191,644.20 is: 287,519.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,317.30 : 587,085.30 = 191,644.20 : x
  2. Step 2: Convert to fraction form
    391,317.30/587,085.30 = 191,644.20/x
  3. Step 3: Cross multiply
    391,317.30x = 587,085.30 × 191,644.20
  4. Step 4: Simplify right side
    391,317.30x = 112,511,492,650.26
  5. Step 5: Solve for x
    x = 112,511,492,650.26/391,317.30
  6. Step 6: Final answer
    x = 287,519.85

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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.