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Finding the Fourth Proportional to 667.65, 1,002.09 and 338.82

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Solution

The fourth proportional to 667.65, 1,002.09 and 338.82 is: 508.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.65 : 1,002.09 = 338.82 : x
  2. Step 2: Convert to fraction form
    667.65/1,002.09 = 338.82/x
  3. Step 3: Cross multiply
    667.65x = 1,002.09 × 338.82
  4. Step 4: Simplify right side
    667.65x = 339,522.79
  5. Step 5: Solve for x
    x = 339,522.79/667.65
  6. Step 6: Final answer
    x = 508.54

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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.