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Finding the Fourth Proportional to 512.50, 768.80 and 220.10

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Solution

The fourth proportional to 512.50, 768.80 and 220.10 is: 330.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.50 : 768.80 = 220.10 : x
  2. Step 2: Convert to fraction form
    512.50/768.80 = 220.10/x
  3. Step 3: Cross multiply
    512.50x = 768.80 × 220.10
  4. Step 4: Simplify right side
    512.50x = 169,212.88
  5. Step 5: Solve for x
    x = 169,212.88/512.50
  6. Step 6: Final answer
    x = 330.17

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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.