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Finding the Fourth Proportional to 512.19, 768.06 and 211.56

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Solution

The fourth proportional to 512.19, 768.06 and 211.56 is: 317.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.19 : 768.06 = 211.56 : x
  2. Step 2: Convert to fraction form
    512.19/768.06 = 211.56/x
  3. Step 3: Cross multiply
    512.19x = 768.06 × 211.56
  4. Step 4: Simplify right side
    512.19x = 162,490.77
  5. Step 5: Solve for x
    x = 162,490.77/512.19
  6. Step 6: Final answer
    x = 317.25

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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.