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Finding the Fourth Proportional to 667.89, 921.69 and 369.16

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Solution

The fourth proportional to 667.89, 921.69 and 369.16 is: 509.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.89 : 921.69 = 369.16 : x
  2. Step 2: Convert to fraction form
    667.89/921.69 = 369.16/x
  3. Step 3: Cross multiply
    667.89x = 921.69 × 369.16
  4. Step 4: Simplify right side
    667.89x = 340,249.35
  5. Step 5: Solve for x
    x = 340,249.35/667.89
  6. Step 6: Final answer
    x = 509.44

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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.