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Finding the Fourth Proportional to 827.63, 1,241.43 and 645.16

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Solution

The fourth proportional to 827.63, 1,241.43 and 645.16 is: 967.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.63 : 1,241.43 = 645.16 : x
  2. Step 2: Convert to fraction form
    827.63/1,241.43 = 645.16/x
  3. Step 3: Cross multiply
    827.63x = 1,241.43 × 645.16
  4. Step 4: Simplify right side
    827.63x = 800,917.88
  5. Step 5: Solve for x
    x = 800,917.88/827.63
  6. Step 6: Final answer
    x = 967.73

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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.