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Finding the Fourth Proportional to 688, 949.80 and 481.36

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Solution

The fourth proportional to 688, 949.80 and 481.36 is: 664.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    688 : 949.80 = 481.36 : x
  2. Step 2: Convert to fraction form
    688/949.80 = 481.36/x
  3. Step 3: Cross multiply
    688x = 949.80 × 481.36
  4. Step 4: Simplify right side
    688x = 457,195.73
  5. Step 5: Solve for x
    x = 457,195.73/688
  6. Step 6: Final answer
    x = 664.53

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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.