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Finding the Fourth Proportional to 828.34, 1,241.36 and 644.90

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Solution

The fourth proportional to 828.34, 1,241.36 and 644.90 is: 966.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.34 : 1,241.36 = 644.90 : x
  2. Step 2: Convert to fraction form
    828.34/1,241.36 = 644.90/x
  3. Step 3: Cross multiply
    828.34x = 1,241.36 × 644.90
  4. Step 4: Simplify right side
    828.34x = 800,553.06
  5. Step 5: Solve for x
    x = 800,553.06/828.34
  6. Step 6: Final answer
    x = 966.45

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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.