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Finding the Fourth Proportional to 667.96, 921.78 and 369.21

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Solution

The fourth proportional to 667.96, 921.78 and 369.21 is: 509.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.96 : 921.78 = 369.21 : x
  2. Step 2: Convert to fraction form
    667.96/921.78 = 369.21/x
  3. Step 3: Cross multiply
    667.96x = 921.78 × 369.21
  4. Step 4: Simplify right side
    667.96x = 340,330.39
  5. Step 5: Solve for x
    x = 340,330.39/667.96
  6. Step 6: Final answer
    x = 509.51

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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.