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Finding the Fourth Proportional to 679.34, 1,016.78 and 481.29

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Solution

The fourth proportional to 679.34, 1,016.78 and 481.29 is: 720.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.34 : 1,016.78 = 481.29 : x
  2. Step 2: Convert to fraction form
    679.34/1,016.78 = 481.29/x
  3. Step 3: Cross multiply
    679.34x = 1,016.78 × 481.29
  4. Step 4: Simplify right side
    679.34x = 489,363.64
  5. Step 5: Solve for x
    x = 489,363.64/679.34
  6. Step 6: Final answer
    x = 720.36

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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.