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Finding the Fourth Proportional to 667.12, 998.72 and 505.44

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Solution

The fourth proportional to 667.12, 998.72 and 505.44 is: 756.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.12 : 998.72 = 505.44 : x
  2. Step 2: Convert to fraction form
    667.12/998.72 = 505.44/x
  3. Step 3: Cross multiply
    667.12x = 998.72 × 505.44
  4. Step 4: Simplify right side
    667.12x = 504,793.04
  5. Step 5: Solve for x
    x = 504,793.04/667.12
  6. Step 6: Final answer
    x = 756.68

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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.