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Finding the Fourth Proportional to 805.96, 1,112.85 and 619.15

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Solution

The fourth proportional to 805.96, 1,112.85 and 619.15 is: 854.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.96 : 1,112.85 = 619.15 : x
  2. Step 2: Convert to fraction form
    805.96/1,112.85 = 619.15/x
  3. Step 3: Cross multiply
    805.96x = 1,112.85 × 619.15
  4. Step 4: Simplify right side
    805.96x = 689,021.08
  5. Step 5: Solve for x
    x = 689,021.08/805.96
  6. Step 6: Final answer
    x = 854.91

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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.