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Finding the Fourth Proportional to 667.70, 921.14 and 418.85

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Solution

The fourth proportional to 667.70, 921.14 and 418.85 is: 577.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.70 : 921.14 = 418.85 : x
  2. Step 2: Convert to fraction form
    667.70/921.14 = 418.85/x
  3. Step 3: Cross multiply
    667.70x = 921.14 × 418.85
  4. Step 4: Simplify right side
    667.70x = 385,819.49
  5. Step 5: Solve for x
    x = 385,819.49/667.70
  6. Step 6: Final answer
    x = 577.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.