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Finding the Fourth Proportional to 680.44, 1,020.64 and 193.48

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Solution

The fourth proportional to 680.44, 1,020.64 and 193.48 is: 290.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.44 : 1,020.64 = 193.48 : x
  2. Step 2: Convert to fraction form
    680.44/1,020.64 = 193.48/x
  3. Step 3: Cross multiply
    680.44x = 1,020.64 × 193.48
  4. Step 4: Simplify right side
    680.44x = 197,473.43
  5. Step 5: Solve for x
    x = 197,473.43/680.44
  6. Step 6: Final answer
    x = 290.21

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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.