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Finding the Fourth Proportional to 768.66, 1,152.09 and 443.37

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Solution

The fourth proportional to 768.66, 1,152.09 and 443.37 is: 664.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.66 : 1,152.09 = 443.37 : x
  2. Step 2: Convert to fraction form
    768.66/1,152.09 = 443.37/x
  3. Step 3: Cross multiply
    768.66x = 1,152.09 × 443.37
  4. Step 4: Simplify right side
    768.66x = 510,802.14
  5. Step 5: Solve for x
    x = 510,802.14/768.66
  6. Step 6: Final answer
    x = 664.54

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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.