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Finding the Fourth Proportional to 512.21, 768.38 and 165.43

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Solution

The fourth proportional to 512.21, 768.38 and 165.43 is: 248.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.21 : 768.38 = 165.43 : x
  2. Step 2: Convert to fraction form
    512.21/768.38 = 165.43/x
  3. Step 3: Cross multiply
    512.21x = 768.38 × 165.43
  4. Step 4: Simplify right side
    512.21x = 127,113.10
  5. Step 5: Solve for x
    x = 127,113.10/512.21
  6. Step 6: Final answer
    x = 248.17

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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.