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Finding the Fourth Proportional to 768.72, 1,063.44 and 676.80

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Solution

The fourth proportional to 768.72, 1,063.44 and 676.80 is: 936.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.72 : 1,063.44 = 676.80 : x
  2. Step 2: Convert to fraction form
    768.72/1,063.44 = 676.80/x
  3. Step 3: Cross multiply
    768.72x = 1,063.44 × 676.80
  4. Step 4: Simplify right side
    768.72x = 719,736.19
  5. Step 5: Solve for x
    x = 719,736.19/768.72
  6. Step 6: Final answer
    x = 936.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.