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Finding the Fourth Proportional to 665.21, 998.73 and 512.12

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Solution

The fourth proportional to 665.21, 998.73 and 512.12 is: 768.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.21 : 998.73 = 512.12 : x
  2. Step 2: Convert to fraction form
    665.21/998.73 = 512.12/x
  3. Step 3: Cross multiply
    665.21x = 998.73 × 512.12
  4. Step 4: Simplify right side
    665.21x = 511,472.10
  5. Step 5: Solve for x
    x = 511,472.10/665.21
  6. Step 6: Final answer
    x = 768.89

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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.