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Finding the Fourth Proportional to 805.73, 1,114.14 and 639.65

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Solution

The fourth proportional to 805.73, 1,114.14 and 639.65 is: 884.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.73 : 1,114.14 = 639.65 : x
  2. Step 2: Convert to fraction form
    805.73/1,114.14 = 639.65/x
  3. Step 3: Cross multiply
    805.73x = 1,114.14 × 639.65
  4. Step 4: Simplify right side
    805.73x = 712,659.65
  5. Step 5: Solve for x
    x = 712,659.65/805.73
  6. Step 6: Final answer
    x = 884.49

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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.