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Finding the Fourth Proportional to 827.80, 1,241.70 and 644.20

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Solution

The fourth proportional to 827.80, 1,241.70 and 644.20 is: 966.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.80 : 1,241.70 = 644.20 : x
  2. Step 2: Convert to fraction form
    827.80/1,241.70 = 644.20/x
  3. Step 3: Cross multiply
    827.80x = 1,241.70 × 644.20
  4. Step 4: Simplify right side
    827.80x = 799,903.14
  5. Step 5: Solve for x
    x = 799,903.14/827.80
  6. Step 6: Final answer
    x = 966.30

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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.