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Finding the Fourth Proportional to 768.69, 1,152.91 and 220.75

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Solution

The fourth proportional to 768.69, 1,152.91 and 220.75 is: 331.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.69 : 1,152.91 = 220.75 : x
  2. Step 2: Convert to fraction form
    768.69/1,152.91 = 220.75/x
  3. Step 3: Cross multiply
    768.69x = 1,152.91 × 220.75
  4. Step 4: Simplify right side
    768.69x = 254,503.13
  5. Step 5: Solve for x
    x = 254,503.13/768.69
  6. Step 6: Final answer
    x = 331.09

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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.