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Finding the Fourth Proportional to 667.85, 999.95 and 551.21

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Solution

The fourth proportional to 667.85, 999.95 and 551.21 is: 825.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.85 : 999.95 = 551.21 : x
  2. Step 2: Convert to fraction form
    667.85/999.95 = 551.21/x
  3. Step 3: Cross multiply
    667.85x = 999.95 × 551.21
  4. Step 4: Simplify right side
    667.85x = 551,174.68
  5. Step 5: Solve for x
    x = 551,174.68/667.85
  6. Step 6: Final answer
    x = 825.30

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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.