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Finding the Fourth Proportional to 667.84, 1,002.20 and 343.42

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Solution

The fourth proportional to 667.84, 1,002.20 and 343.42 is: 515.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.84 : 1,002.20 = 343.42 : x
  2. Step 2: Convert to fraction form
    667.84/1,002.20 = 343.42/x
  3. Step 3: Cross multiply
    667.84x = 1,002.20 × 343.42
  4. Step 4: Simplify right side
    667.84x = 344,175.52
  5. Step 5: Solve for x
    x = 344,175.52/667.84
  6. Step 6: Final answer
    x = 515.36

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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.